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4.5×1.2%2.8×1.2简便算法.谢谢

提出1.2,原式=(4.5-2.8)*1.2 =1.7*1.2 =1.7*(1+0.2) =1.7*1+1.7*0.2 =1.7+0.34 =2.04 如果解决了你的问题,记得采纳哦 新的问题请重新提问

2.8×(2.8-1.2)÷14% =(2.8÷14%)×(2.8-1.2) =10×1.6 =16

2.8×1.4+3.6×1.2 =3x1.4-0.2x1.4+4x1.2-0.4x1.2 =4.2-0.28+4.8-0.48 =9-0.76 =8.24

1.2+1.8+1.4+2.6+3-(1.6+2.4+2+2.8) =3+4+3-(4+2+2.8) =10-8.8 =1.2

(1)0.25×1.2+2.8×0.25,=0.25×(1.2+2.8),=0.25×4,=1;(2)0.65×101,=0.65×(100+1),=0.65×100+0.65×1,=65+0.65,=65.65;(3)67.8-7.8×4.9,=67.8-38.22,=29.58;(4)3.2×1.25×2.5,=(0.8×1.25)×(4×2.5),=1×10,=10;(5)0...

(1)1.2×2.5+2.8×2.5 =2.5×(1.2+2.8)=2.5×4=10 (2)4.8×2.5 =4×1.2×2.5=4×2.5×1.2=10×1.2=12(3)26.34-0.36-5.64=26.34-(0.36+5.64)=26.34-6=20.34

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

答案应该是2.4,不懂可继续追问

(1)1.2×2.5+2.8×2.5,=(1.2+2.8)×2.5,=4×2.5,=10;(2)4.8×2.5,=(4×1.2)×2.5,=(4×2.5)×1.2,=10×1.2,=12.

2.8×1.7×5÷1.7 =2.8x5x(1.7÷1.7) =2.8x5 =14

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