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1.35除以(1.35乘以0.8)简便脱式计算

解答题

=(1.25+0.1)×4.2×0.8 =(1.25×0.8+0.1×0.8)×4.2 =(10+0.08)×4.2 =10×4.2+0.08×4.2 =42+0.336 =42.336

4.2×(1.25乘以0.8) =4.2x(1.25x0.8) =4.2x1 =4.2

0.8×1.2÷0.8×1.2 =(0.8÷0.8)×(1.2×1.2) =1×1.44 =1.44

(8.1÷0.4+0.5)×0.6 =(8÷0.4+0.1÷0.4+0.5)×0.6 =(20+0.25+0.5)×0.6 =20×0.6+0.25×0.6+0.5×0.6 =12+0.15+0.3 =12.45

9.8/0.35 =980/35 =98*10/5/7 =(98/7)*(10/5) =14*2 =28

(1)[9.2+0.8×(9-7.75)]÷0.4=[9.2+0.8×1.25]÷4=[9.2+1]÷4=2.55 (2)3.5×9.8+0.35×2=3.5×(9.8+0.2)=3.5×10=35(3)28×2627=(27+1)×2627=27×2627+2627=26+2627=262627(4)[(23-35)×154+23]÷1112=[115×154+23]÷1112=[14+23]÷1112=1112×1...

(1)2.65×1.7+1.35×1.7,=(2.65+1.35)×1.7,=4×1.7,=6.8;(2)23.4÷7.8-2.1,=3-2.1,=0.9;(3)0.75×18÷0.15,=0.75÷0.15×18,=5×18,=90;(4)2.5×3.2×1.25,=2.5×4×0.8×1.25,=(2.5×4)×(0.8×1.25),=10×1,=10.

8.1÷4.5÷0.2 =8.1÷(4.5×0.2) =8.1÷0.9 =9

括号里的20-1点二五×0点八括起来除以一点九脱式计算 解: (20-1.25×0.8)÷1.9 =(20-1)÷1.9 =19÷1.9 =10

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