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4.5×1.2%2.8×1.2简便算法.谢谢

(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...

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

7.2+2.8×5-1.2 =7.2-1.2+14×0.2×5 =6+14 =20

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

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)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)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.

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

0.25×[(2.8+4.4)÷1.2] =0.25×(7.2÷1.2) =0.25×6 =1.5 不懂可追问,有帮助请采纳,谢谢!

4.05–2.8–1.2的简便运算 解: 4.05–2.8–1.2 =4.05-(2.8+1.2) =4.05-4 =0.05

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