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(8+0.4)×0.25脱式计算

(8+0.4)×0.25 =8×0.25+0.4×0.25 =2+0.1 =2.1

=(0.96-0.5)*4 =0.46*4 =1.84

(1)0.175÷0.25×4,=0.7×4,=2.8;(2)54÷(3.94+6.86),=54÷10.8,=5;(3)12.8+2.04×9.5,=12.8+19.38,=32.18;(4)4.5×0.9+5.5×0.9,=(4.5+5.5)×0.9,=10×0.9,=9.

4÷0.8-0.8÷4 =5-0.2 =4.8

0.25×0.88×4 =(0.25x4)x0.88 =1x0.88 =0.88 应用乘法交换律、结合律。 希望能帮到你!

1.25x(0.4+0.8) =1.25×0.4+1.25×0.8 =0.5+1 =1.5

4×0.8×0.25×12.5 =4×0.25×(0.8×12.5) =1×10 =10

(1)96÷(15.4-12.2),=96÷3.2,=30;(2)9÷[0.3×(8-6.5)],=9÷[0.3×1.5],=9÷0.45,=20;(3)0.175÷0.25÷0.4,=0.175÷(0.25×0.4),=0.175÷0.1,=1.75;(4)0.175÷0.25×4,=0.7×4,=2.8;(5)0.36÷[(6.1-4.6)×0.8],=0.36÷[1.5×0.8]...

(1)4.57+3.34÷0.2=4.57+16.7,=21.27;(2)1.68÷0.25÷0.4=1.68÷(0.25×0.4),=1.68÷0.1,=16.8;(3)2.5×0.7+7.5×0.7=(2.5+7.5)×0.7,=10×0.7,=7;(4)0.125×0.32×0.25=(0.125×0.8)×(0.4×0.25)=0.1×0.1,=0.01.

(1)12.5×0.4×2.5×8,=(12.5×8)×(0.4×2.5),=100×1,=100;(2)0.87×6.6+8.7×0.34,=0.87×6.6+0.87×10×0.34,=0.87×6.6+0.87×3.4,=0.87×(6.6+3.4),=0.87×10,=8.7;(3)9.07-22.78÷3.4,=9.07-6.7,=2.37.

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