简便计算4.6×1.25+1.25+1.5×0.34 4.28×99 15×0.4×2.5
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简便计算
4.6×1.25+12.5×0.34
=4.6×1.25+1.25×3.4
=(4.6+3.4)×1.25
=8×1.25
=10
4.28×99
=4.28×(100-1)
=4.28×100-4.28
=428-4.28
=423.72
15×0.4×2.5
=15×(0.4×2.5)
=15×1
=15
4.6×1.25+12.5×0.34
=4.6×1.25+1.25×3.4
=(4.6+3.4)×1.25
=8×1.25
=10
4.28×99
=4.28×(100-1)
=4.28×100-4.28
=428-4.28
=423.72
15×0.4×2.5
=15×(0.4×2.5)
=15×1
=15
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