用简便方法计算下面各题4.8X0.25
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解答1
=4×1.2×0.25
=4×0.25×1.2
=1×1.2
=1.2
解答2
=(4+0.8)×0.25
=4×0.25+0.8×0.25
=1+0.2
=1.2
解答3
=4.8×1/4
=1.2
=4×1.2×0.25
=4×0.25×1.2
=1×1.2
=1.2
解答2
=(4+0.8)×0.25
=4×0.25+0.8×0.25
=1+0.2
=1.2
解答3
=4.8×1/4
=1.2
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4.8×0.25
=1.2×4×0.25
=1.2×(4×0.25)
=1.2×1
=1.2
=1.2×4×0.25
=1.2×(4×0.25)
=1.2×1
=1.2
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