Question

(1.25X3/8÷5/8)X84.6X0.25-3/5÷ 4,怎样简便算？

Answer 1

解法如上图。

Answer 2

原式=（5/4x3/8x8/5）x84.6x1/4-3/5x1/4
=3/4x84.6x1/4-3/20
=3x84.6-3/20
=3（84.6-0.05）
=3x84.55
=3x80+3x4+3x0.55
=240+12+1.65
=253.65

Answer 3

(1.25×3/8÷5/8)×84.6×0.25－3/5÷4

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=(1.25×3/8×8/5)×84.6×0.25－3/5×1/4

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=0.25×3×84.6×0.25－0.15

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=15.8625－0.15

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=15.7125

Answer 4

(1.25X3/8÷5/8)×84.6×0.25-3/5÷ 4
=（5/4×3/8×8/5）×84.6×0.25－3/5×0.25
=3/4×84.6×0.25－3/5×0.25
=63.45×0.25－0.6×0.25
=（63.45－0.6）×0.25
=62.85×0.25
=15.7125

Answer 5

∵(1.25X3/8X8/5)X84.6X1/4一3/5X1/4
=(5/4X3/5)X423/5X1/4一3/5X1/4
=1/4(3X423/5一3/5)
=1/4(1269/5一3/5)
二1/4X1263/5
=1263/20
二63.15