72x0.99 0.25x3.2x12.5 48x1.25 2.5x1.2 简便计算
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72×0.99
=72×(1-0.01)
=72×1-72×0.01
=72-0.72
=71.29
0.25×3.2×12.5
=(0.25×4)×(0.8×12.5)
=1×1
=1
48×1.25
=6×(8×1.25)
=6×10
=60
2.5×1.2
=(2.5×0.4)×3
=1×3
=3
=72×(1-0.01)
=72×1-72×0.01
=72-0.72
=71.29
0.25×3.2×12.5
=(0.25×4)×(0.8×12.5)
=1×1
=1
48×1.25
=6×(8×1.25)
=6×10
=60
2.5×1.2
=(2.5×0.4)×3
=1×3
=3
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