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3.2Ⅹ9.9 0.32脱式计算,能简算的要简算

(1)0.8×3.9×1.25=0.8×1.25×3.9=1×3.9=3.9(2)4.87×2.34+4.87×7.66=4.87×(2.34+7.66)=4.87×10=48.7(3)0.49×9.9=0.49×(10-0.1)=0.49×10-0.49×0.1=4.9-0.049=4.851(4)60.8-7.18-12.82=60.8-(7.18+12.82)=60.8-20=40.8(5)2.5×3.2×12...

(1)5.46÷3.9+4.5×2.3,=1.4+10.35,=11.75;(2)4.23×9.9+0.423,=4.23×9.9+4.23×0.1,=4.23×(9.9+0.1),=4.23×10,=42.3;(3)2.58-(3.5-2.4),=2.58-1.1,=1.48;(4)78÷0.25÷0.4,=78÷(0.25×0.4),=78÷0.1,=780.

原式 =10.1x99-9.9 =10.1x99-0.1x99 =(10.1-0.1)x99 =10x99 =990 供参考。

4.8x9.9脱式计算能简算要简算 4.8x9.9 =4.8*10-4.8*0.1 =48-0.48 =47.52

如图

原式=8/9÷(4/3-2/3) =8/9÷2/3 =8/9 ×3/2 =4/3

(1)17.59-9.74+5.73=7.85+5.73=13.58;(2)19.92+11.55-9.92=19.92-9.92+11.55=10+11.55=21.55;(3)67.44-(15.72-23.89)=67.44-15.72+23.89=51.72+23.89=75.61;(4)40-(2.75+0.14)=40-2.89=37.11;(5)8.84+4.16-8.84+4.16=(8.84-8...

5.7x9.9 =5.7x(100一0.1) =5.7x100-5.7x0.1 =570-0.57 =569.43

5/9-2/11+4/9-9/11 =(5/9+4/9)-(2/11+9/11) =9/9-11/11 =1-1 =0

(1)2.72÷[(8.2-6.5)×0.5]=2.72÷[1.7×0.5],=2.72÷0.85,=3.2;(2)9.12+9.12×9-60.2=(1+9)×9.12-60.2,=10×9.12-60.2,=91.2-60.2,=31;(3)28.4÷0.4÷0.25=28.4÷(0.4×0.25),=28.4÷0.1,=284;(4)27.36-27.36÷7.6=27.6-3.6,=24.

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