2.01×7.8,14.5 3.7 5.5,1.6×1.25×0.5简便计算
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2.01×7.8
=2×7.8+0.1×7.8
=15.6+0.078
=15.678
14.5 3.7 5.5,
=14.5+5.5+3.7
=20+3.7
=23.7
1.6×1.25×0.5
=0.2×8×1.25×0.5
=(0.2.×0.5)×(8×1.25)
=0.1×10
=1
=2×7.8+0.1×7.8
=15.6+0.078
=15.678
14.5 3.7 5.5,
=14.5+5.5+3.7
=20+3.7
=23.7
1.6×1.25×0.5
=0.2×8×1.25×0.5
=(0.2.×0.5)×(8×1.25)
=0.1×10
=1
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