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4.5×1.2%2.8×1.2简便算法.谢谢

1、=(2x5)^4x2=200003、=8^8x(1/8)^8=14、=(3x2/3)^5x5^6=(2x5)^5x5=500000

2.04

(1)2.8×7.6+1.4×2.8+2.8 =2.8×(7.6+1.4+1)=2.8×10=28(2)4.5×1.2-3.15÷15=5.4-0.21=5.19(3)[12.8-(7.5+4.5)]×2.5=[12.8-12]×2.5=0.8×2.5=2(4)0.65+2.7+0.35+7.3 =(0.65+0.35)+(2.7+7.3)=1+10=11(5)3.8×0.56+0.56×6.2=(3.8+6.2...

5.6×2.4÷2.8÷1.2=5.6×2.4×1/2.8×1/1.2=5.6×1/2.8×2.4×1/1.2=2×2=4

2.1+2.8+2.4-1.2-1.6-1.4-2.1 =2.1-2.1+2.4-1.4+2.8-(1.2+1.6) =0+1+2.8-2.8 =1

1.2×2.8×1.2÷2.8 =(1.2×1.2)×(2.8÷2.8) =1.44×1 =1.44

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

简便运算 2.45x1.2÷2.8 =(2.45÷0.7)×(1.2÷4) =3.5×0.3 =1.05

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

(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.

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