如题所述
0.75=3/4
原式=3/4*(1/5+2/5+3/5-1)
=3/4*1/5
=3/20
原式=3/4*(1/5+2/5+3/5-1)
=3/4*1/5
=3/20
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第1个回答 2016-09-24
(3/4)x(1/5)+(3/4)(2/5)+(3/4)(3/5)-(3/4)
=(3/4) [(1/5)+(2/5)+(3/5)-1]
=(3/4) [(6/5)-1]
=(3/4)(1/5)
=3/20
=(3/4) [(1/5)+(2/5)+(3/5)-1]
=(3/4) [(6/5)-1]
=(3/4)(1/5)
=3/20