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1、一、 能简算的要简算10.82380 0.4(1.5 )1.250.25 24(1) 0.2 36(21) 9() 1()1 ( 5.4 1)(10.65)10.7 0.7 + 0.7 8( + )1(2 2.05) ()3 ( + ) ( +) +4 1.25 0.75 +0.4 ( + )243.2(1)+ 32 1 +2 +4 +31.8 + 2.225 24( +)10513 - 189018 ( +)0.899+0.8 33 7.86.35+9.20.655980.37+0.635.98 7.651(33.09)20() 645.67+ 0.36567 ( + )2416.312.3
2、1 ( +)8+ 1.252.532 + 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+9.25 201.37.36320.13 3.64(0.6)0.83.60.80.6 8.86.75+9.20.25 (+)24 + 4.871(2.12.09) 2()9 6568
3、198 ( )15.8+14.2 39(+) 3 + 5+108.5+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=6.5 x1.4=3.6+x :x=x:0.75X(+)= :8=x: 3x+31.5=9:=4x: 7.5:x=24:12 3x6
4、=8.25xx=63 :=x:0.1 x+x=:=x: x=4 :=:x2x+2.7=24.7 0.6:36%=:x 4.2x3=6.44Xx=3.6 = : =x:15xx=4.9 6:x=: 8x39=37= :x=:6 :0.1=x:3610.5+x=3 0.3652x=0.4 =X+x= 12x+730%=14.7 x0.85x=30 :4=x: : =x: (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)10.82+385% +0.4(1.5)1.250.25 24(1)+ 0.2+36(21+) 9(+)1(
5、+)1 (5.41)(1+0.65) 10.7+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=12 :=x:12 (x+9)=5x : =x:2x= 87
6、5%3x=2.1 =5.8:2.9() 8.79998.794125%0.25+60 41.250.75+0.4321.6+1.667+1.6 2015 10.18.60.861(+) 8.0998+8.092(1+) 2.5(1.9+1.9+1.9+1.9) (+) (+)17 191.8+2.225% () 251.25324.21.51.560% 4.831.56+0.172.4499+999.9 24+51 0.651016.73.25+3.30.75 5.21173+ 55(77) 3.41.8+7.62.212.53225% 1()364.599+4.5 47 7.86.35+2.20.65 () 36(+)0.4+ (1)(+)+ 980.8+80% 251.25400.8(+)2119 6.76.7+6.72.1+6.71.248(+) +9+99+999+9999+ (+)271.8+2.225% (11) 5.58+5.4236(+) 0.7599+ 0.75 86.67(14.67+15.3)2532125 57.814.2515.75 +50% (1+)+ 2009 18.5(8.5+9.3)1()3 72()+10 12.18(3.184.23)0.65201 0.20.2550.4 0.8412.52.5