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4.5×1.2%2.8×1.2简便算法.谢谢

7.2+2.8×5-1.2 =7.2+14-1.2 =21.2-1.2 =20

1.2x2.8x0.5÷4.8 =3.36x0.5÷4.8 =1.68÷4.8 =0.45

7.2 +2.8×5-1.2 =(7.2-1.2)+(3-0.2)×5 =6+3×5-0.2×5 =6+15-1 =20

原式=2.8×23.4+11.1×8×7.2+65.4×2.8 =2.8×(23.4+65.4)+88.8×7.2 =2.8×88.8+7.2×88.8 =88.8×(2.8+7.2) =88.8×10 =888

1.2: 2.8的比值是12:28=3: 7 答案: ( 3/7 ) 望采纳

7.1÷0.25怎么拖试计算 7.1÷0.25 =(7.1x4)÷(0.25x4) =28.4÷1 =28.4 希望能帮到你

2.8X1.4+3.6X1.2 =(3-0.2)×1.4+(4-0.4)×1.2 =3X1.4-0.2X1.4+4X1.2-0.4X1.2 =4.2-0.28+4.8-0.48 =4.2+4.8-0.28-0.48 =9-0.28-0.48 =8.24

3.6×1.2×0.5分之2.8×1.8×4 =3.6×1.2×14×1.8×4 =4.32×14×1.8×4 =60.48×1.8×4 =108.864×4 =435.456 不能简算

(1)2.8÷ 1 2 × 1 2 ÷0.7=(2.8÷0.7)÷( 1 2 ÷ 1 2 ),=4÷1,=4;(2) 5 4 ×4.8÷( 11 3 ÷ 5 3 +0.2)= 5 4 × 24 5 ÷ 12 5 ,=2.5;(3)0.4×9×25=0.4×25×9,=10×9,=90;(4) 7 8 × 1 4 +0.25×0.125=0.875×0.25+0.25×0.125,=(0.875+0.1...

3.8x1.2+3.8x2.8=3.8x(1.2+2.8)=3.8x4=15.2

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