1、3 7.86.35+9.20.655980.37+0.635.98 7.65(33.09)20() 645.67+ 0.36567 ( + )16.312.31 ( +)8+ 2.532 + 4.8533.6+ 6.153() 240 +45015 + 5 42(1) () 20345+180 12 +4()(+)3240 +45018 2.254.8 + 77.50.48 +()(+)3.59.9+0.35 10.2(1.75+)50%12142(4.46+0.14) 0.75+75%38(4.20.4) 0.5 (+)(+) (+)1421 9 9.8+9.25 201.37.36320.
2、13 3.64(0.6)3.60.80.6 8.86.75+9.20.25 (+)24 + 4.87(2.12.09) 2()9 6568198 ( )15.8+14.2 39(+) 3 + 5108.5+0.755+6.51 +(0.25)3.62.8+7.47.2 23+(+) 18 +()3.2554 7.77+7.7+27.7 (0.25+)(1.75)+ (80%60%)99+9980% 18 +(+) 0.251.25二、解方程6:4.8= 3(x1.2)=1.5x+0.9 14:=4: xxx+2=14 :4=x: xx2=5 xx+1=13 42:x=: :=:x30.7+4x
3、=6.5 x1.4=3.6+x :x=x:0.75X(+)= :8=x: 3x+31.5=9:=4x: 7.5:x=24:12 3x6=8.25xx=63 :=x:0.1 x+x= x=4 :=:2x+2.7=24.7 0.6:36%=:x 4.2x3=6.4Xx=3.6 = : =x:15xx=4.9 6: 8x39=37= :6 :0.1=x:360.5+x=3 0.3652x=0.4 =X+x= 12x+730%=14.7 x0.85x=30 : (1+10%)x=33三、脱式计算(能简算的要简算) (2(+)4.85 33.4+0.153 7.53(42.5)0.82+385% +0.
4、4(1.5)24(1)+ 0.2+(21+) 9(+)1 (5.41)(1+0.65) +0.7+0.7 8(+)7.635%+6.50.76 (1514)+ 521192813 21.7(15.7+2)3 1.2517.6+36.180%+2.6312.597 54.80.80.40.68 6.9610.10.6962.750.72+2.75 + (0.375 ) 0.250.390.4 63.75(3.5+13.75) 7.10.12586.73.25+13.375% + 3.2四、 解方程Xx= 10.12x=1.86 +=1= 8440%x =28 x20%x=1212 (x+9)=5
5、x :2x= 875%3x=2.1 =5.8:2.9( 8.79998.794125%0.25+60 41.250.75+0.41.6+1.667+1.6 2015 10.18.60.861(+) 8.0998+8.092(1+) 2.5(1.9+1.9+1.9+1.9) (+)17 19+2.225% () 25324.21.51.560% 4.831.56+0.172.4499+999.9 24+51 0.651016.73.25+3.30.75 5.2117+ 5(7) 3.41.8+7.62.212.525% 1()4.599+4.5 47 7.86.35+2.20.65 () 36(
6、+)0.4+ (1+ 980.8+80%400.8(+)2119 6.76.7+6.72.1+6.71.248(+) +9+99+999+9999+ (+)2725% (11) 5.58+5.42(+) 0.7599+ 0.75 86.67(14.67+15.3)25125 57.814.2515.75 50% (1+)+ 2009 18.5(8.5+9.3)3 72()+10 12.18(3.184.23)0.65201 0.250.4 0.842.53 3.67+60.33 100542() 452 857 1.98.578085.7(+)24 320.1250.50.255.14+4.9
7、25% 7(22.3) 103.625.38+ 7.83.3+7.87.77.8 2+ 99解方程3(x5)=8.4 3xx= 4x25%x=18.75X: =0.07: 8.2x=4 =+=9 x:15=: xx=21 =: 69x=26.8 :=8:+x=35 (1+20%)x =0.4 6.832%x=3x+4=5 x:2.4=5: 75%x=X0.85x=3 5x20%x=19.2 :25%=:x=0.4: 0.4x+x=153.8 xx=2.1: 2:2=x:5 4.83x=12x8x=20 12(0.5x1)=4 40%x14=72= 1.25:2.4 x+x1=65x=1:2 4
8、x2.5x=0.75 8(x2)=2x+7x: =4:7 x25%x=12.68(1+) 3.932.6+39.30.7420%+20%+ 60%40%()10(8.8)+ (+)12177560%+24+0.6 0.2525%+()32 (+) (+50%) ()4.40.25 7.259.9+72.5% 8.50.9+8.50.1 28.92.55+1.17.453.81.01 ()(1.60.4) 0.43.757.0998+7.092 493.75 9.7+6.6253.644+4.360.25 18.2511.811.817.257.54.2(1) (2+)(2+)8(60%+2)1
9、.7 15.95(5.9510)89737.5%+1040.375 2554.254.5(37.5)3 97 52.61.8318.17 67.50.39+3.253.9 (1) 1.253.850.0089.9+0.38 0.627(3.83+6.17) 56.96(19.55+6.96)4() 53199 3 5.2+4.8 39.843+39.838+3981.9 8.765.292.71+1.24 () 120.912.68(2.684.5) 1.015.25.20.01() (5.65.60.7)22.4 0.8 15.283.999.01+9+99+999+9999 4.8799+4.870.5322+5.37.8 + 24 4.87(2.98+0.87) 80.4(1814) 20.25(4)72%6434 7+3.52+2+5.4889.343+0.578930 70.08解方程或比例1.7+x=24.5 x10=2.5 3.563x=11x=96 x =12 =xx= 125%x= :x=2:x30%x=84 x+8=35 x12=40 3(x+2.1)=10.5 :10 x:28%=:0.70.5x
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