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用简便方法计算下面各题2.8×4.5+5.5×2.810.1×89

(1)2.8×4.5+5.5×2.8 =(5.5+4.5)×2.8,=10×2.8,=28;(2)10.1×89-8.9 =101×8.9-8.9,=(101-1)×8.9,=100×8.9,=890;(3)930÷5÷0.6=930÷(5×0.6),=930÷3,=310.

(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+5.31+7.2+4.69 =(2.8+7.2)+(5.31+4.69) =10+10 =20

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