简算(1)4×0.8×1.25×0.25 (2)(1/2+1/3+1/4+1/5)×60
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简算(1)4×0.8×1.25×0.25 (2)(1/2+1/3+1/4+1/5)×60
简算(1)4×0.8×1.25×0.25 (2)(1/2+1/3+1/4+1/5)×60
简算(1)4×0.8×1.25×0.25 (2)(1/2+1/3+1/4+1/5)×60
4×0.8×1.25×0.25
=4x0.25x0.8x1.25
=1x1
=1
(1/2+1/3+1/4+1/5)×60
=1/2x60+1/3x60+1/4x60+1/5x60
=30+20+15+12
=77
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