1、1.25（8+10）=1.258+1.2510=10+12.5=22.59123-（123+8.8）=9123-123-8.8=9000-8.8=8991.21.248.3+8.31.76=8.3（1.24+1.76)=8.33=24.999991001=9999（1000+1）=99991000+99991=1000899914.86.3-6.36.58.33.7=（14.8-6.5）6.38.33.7=8.36.3+8.33.78.3（6.33.7）=8.310=831.24+0.78+8.76=（1.24+8.76）+0.78=10+0.78=10.78933-157-43=933-（1
2、57+43）=933-200=7334821-998=4821-1000+2=3823I3212525=4812525=（425）（8125）=1001000=1000009048268=（2600+2600+2600+1248）26=260026+260026+260026+1248269=100+100+100+48=348288143=（1290+1591）434=129043+159143=30+373.242.33.75-12.50.42316=3.242.33.75-1.2542.31.6=42.3(3.23.75-1.251.6)=42.3(40.83.75-1.2540.4
3、)=42.3(40.423.75-1.2540.4)=42.3(4x0.4x7.5-1.25x4x0.4)=42.340.4(7.5-1.25)=42.340.46.25=42.3(42.5)=42371.8+181.5-0.50.3=1.8+12-0.15=13.8-0.15=13.656.58+3.58-47=52+28-47=80-47(80-9.8)5分之2-1.32=70.2X2/5-1.32=28.08-1.32=26.7687分之41(3.2-2.95)=84/710.25=84/74=8/72700（506499）900=27007900=18900900=2133.02（14
4、8.490.85）2.5=33.0257.552.5=33.0223.02=10（111）5.1=（11）5.1=05.1=018.1（30.2990.23）1=18.11.71=18.11.7=19.8-18+29+-52+60=19-3+-2+-1+0+1+2=-3-301+125+301+-75=50-1+-1/2+3/4+-1/4=-1-7/2+5/6+-0.5+4/5+19/6=1.25-26.54+-6.14+18.54+6.14=-81.125+-17/5+-1/8+-0.6=-3-98+76+(-87)*2356+(-75)-(7)-(8+4+3)5+21*8/2
5、-6-5968/21-8-11*8+61-2/9-7/9-564.6-(-3/4+1.6-4-3/4)1/2+3+5/6-7/122/3-4-1/4*(-0.4)/1/3+222+(-4)+(-2)+4*3-2*8-8*1/2+8/1/8(2/3+1/2)/(-1/12)*(-12)(-28)/(-6+4)+(-1)2/(-2)+0/7-(-8)*(-2)(1/4-5/6+1/3+2/3)/1/218-6/(-3)*(-2)(5+3/8*8/30/(-2)-3(-84)/2*(-3)/(-6)1/2*(-4/15)/2/3-3x+2y-5x-775-（12+18）15
6、2160（83-79）1828084024532513(266250)85(95144024)58870(105202)1437272756381432(135278)37.85-（7.85+6.4）30156(17.7-7.2)3（947599）766436(91327623)192（5438）67（7.1-5.6）0.9-1.152.581432(135278)5.42.6（3.7-2.9）+0.62（947599）766460(9.528.9)0.182.8810.430.243.520(2.441.8)0.40.1528-(3.41.252.4)0.815
7、.5-(3.215.79)（31.83.24）519464.81.80.936.724.259.93.416（0.01635）0.8(106.76)1.2（136+64）（65-34523）(6.8-6.80.55)8.50.124.80.124.8（58+37）（64-95）812-700（9+3111）（3.21.5+2.5）1.685+14（14+20826）120-36418+35（284+16）（512-820818）9.721.6-18.30574/71/3（3/5-3/10）（4/5+1/4）7/3+7/1012.780（13.4156.6）37
8、.812-700（9+3111）（136+64）（65-34523）3.2（1.5+2.5）1.685+14（14+20826）（58+37）（64-95）(6.8-6.80.55)8.5（284+16）（512-820818）0.124.80.124.8（3.21.5+2.5）1.6120-36418+3510.15-10.750.4-5.75.8（3.87-0.13）+4.23.74347+452-41605232.52-（6+9.7283.2）2.587（58+37）（64-95）（7.1-5.6）0.9-1.152.5（3.21.5+2.5）1.65.42.6（3
9、.7-2.9）+0.62126（12-7.2）-63.26+（1.5+2.5）1.6（3.21.5+2.5）1.65.8（3.87-0.13）+4.23.7433.02（148.490.85）2.51)23+(-73)(2)(-84)+(-49)(3)7+(-2.04)(4)4.23+(-7.57)(5)(-7/3)+(-7/6)(6)9/4+(-3/2)(7)3.75+(2.25)+5/4(8)-3.75+(+5/4)+(-1.5)(9)(-17/4)+(-10/3)+(+13/3)+(11/3)(10)(-1.8)+(+0.2)+(-1.7)+(0.1)+(+1.8)+(+1.4)(1
10、1)(+1.3)-(+17/7)(12)(-2)-(+2/3)(13)|(-7.2)-(-6.3)+(1.1)|(14)|(-5/4)-(-3/4)|-|1-5/4-|-3/4|)(15)(-2/199)*(-7/6-3/2+8/3)(16)4a)*(-3b)*(5c)*1/61.3/749/9-4/32.8/915/36+1/273.125/62/934.85/4+1/45.63/83/866.4/75/9+3/75/97.5/2-（3/2+4/5）8.7/8+（1/8+1/9）9.95/6+5/610.3
11、/48/9-1/30.121.80.9=7.2(95)0.3=1.026.4-=28+4.411.75/49+3/1412.6（1/2+2/3）13.84/5+811/514.315/65/615.9/7-（2/710/21）16.5/918142/717.4/525/16+2/33/418.148/75/612/1519.17/323/49/2420.32/9+1/321.5/73/25+3/722.3/142/3+1/623.1/52/3+5/624.9/22+1
12、/111/225.5/311/5+4/326.452/3+1/31527.7/19+12/195/628.1/4+3/42/329.8/721/16+1/230.1011/51/52131.5016040（58+370）（64-45）32.120-14418+3533.347+452-41605234（58+37）（64-95）35.95（64-45）36.178-14556+42420+580-64212837.812-700（9+3111）（136+64）（65-34523）38.85+14（14+20826）39.（284+16）
13、（512-820818）40.120-36418+3541.（58+37）（64-95）42.(6.8-6.80.55)8.543.0.124.80.124.844.（3.21.5+2.5）1.6（2）3.2（1.5+2.5）1.645.6-1.64=5.38+7.85-5.37=46.7.20.8-1.25=6-1.193-0.43=47.6.5（4.8-1.24）=0.681.9+0.321.948.10.15-10.750.4-5.749.5.8（3.87-0.13）+4.23.7450.32.52-（6+9.7283.2）2.551.-5+58+13+90+78-(-56)+
14、5052.-7*2-57/(353.(-7)*2/(1/3)+79/(3+6/4）54.123+456+789+98/(-4)55.369/33-(-54-31/15.5)56.39+3x42/2x(3x8)57.9x8x7/5x(4+6)58.11x22/(4+12/2)59.94+(-60)/101.a3-2b3+ab(2a-b)=a3+2a2b-2b3-ab2=a2(a+2b)-b2(2b+a)=(a+2b)(a2-b2)=(a+2b)(a+b)(a-b)2.(x2+y2)2-4y(x2+y2)+4y2=(x2+y2-2y)23.(x2+2x)2+3(x2+2x)+x2+2x+3=(x2
15、+2x)2+4(x2+2x)+3=(x2+2x+3)(x2+2x+1)=(x2+2x+3)(x+1)24.(a+1)(a+2)+(2a+1)(a-2)-12=a2+3a+2+2a2-3a-2-12=3a2-12=3(a+2)(a-2)5.x2(y+z)2-2xy(x-z)(y+z)+y2(x-z)2=x(y+z)-y(x-z)2=(xz+yz)2=z2(x+y)26.3(a+2)2+28(a+2)-20=3(a+2)-2(a+2)+10=(3a+4)(a+12)7.(a+b)2-(b-c)2+a2-c2=(a+b)2-c2+a2-(b-c)2=(a+b+c)(a+b-c)+(a+b-c)(a-
16、b+c)=(a+b-c)(a+b+c+a-b+c)=2(a+b-c)(a+c)8.x(x+1)(x2+x-1)-2=(x2+x)(x2+x-1)-2=(x2+x)2-(x2+x)-2=(x2+x-2)(x2+x+1)=(x+2)(x-1)(x2+x+1)1.3/749/9-4/32.8/915/36+1/273.125/62/934.85/4+1/45.63/83/866.4/75/9+3/75/97.5/2-（3/2+4/5）8.7/8+（1/8+1/9）9.95/6+5/610.3/48/9-1/3
17、0.121.80.9=7.2(95)0.3=1.026.4-=28+4.411.75/49+3/1412.6（1/2+2/3）13.84/5+811/514.315/65/615.9/7-（2/710/21）16.5/918142/717.4/525/16+2/33/418.148/75/612/1519.17/323/49/2420.32/9+1/321.5/73/25+3/722.3/142/3+1/623.1/52/3+5/624.9/22+1/111/225.5
18、/311/5+4/326.452/3+1/31527.7/19+12/195/628.1/4+3/42/329.8/721/16+1/230.1011/51/52131.5016040（58+370）（64-45）32.120-14418+3533.347+452-41605234（58+37）（64-95）35.95（64-45）36.178-14556+42420+580-64212837.812-700（9+3111）（136+64）（65-34523）38.85+14（14+20826）39.（284+16）（512-820818）
19、40.120-36418+3541.（58+37）（64-95）42.(6.8-6.80.55)8.543.0.124.80.124.844.（3.21.5+2.5）1.6（2）3.2（1.5+2.5）1.645.6-1.64=5.38+7.85-5.37=46.7.20.8-1.25=6-1.193-0.43=47.6.5（4.8-1.24）=0.681.9+0.321.948.10.15-10.750.4-5.749.5.8（3.87-0.13）+4.23.7450.32.52-（6+9.7283.2）2.551.-5+58+13+90+78-(-56)+5052.-7*2-57/(353.(-7)*2/(1/3)+79/(3+6/4）54.123+456+789+98/(-4)55.369/33-(-54-31/15.5)