题目内容
用简便方法计算下面各题
2.8×4.5+5.5×2.8
10.1×89-8.9
930÷5÷0.6.
2.8×4.5+5.5×2.8
10.1×89-8.9
930÷5÷0.6.
(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.
=(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.
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