20x(3/4+1/5-1/4)
=20x3/10
=6
满意请采纳哦 谢谢！
9/13×0.4+2/5×4/13＝多少
(5/6÷5-1/10)×(1-1/4)＝多少
追答①9/13×0.4+2/5×4/13
=9/13x2/5+2/5x4/13
=2/5x(9/13+4/13)
=2/5x1
=2/5
②(5/6÷5-1/10)×(1-1/4)
=(1/6-1/10)x3/4
=2/30x3/4
=1/20
不好意思，回答晚了！ 满意请采纳哦 谢谢！
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第1个回答 2016-02-15
20X(3/4+1/5-0.25)
=20X(3/4+1/5-1/4)
=20X(2/4+1/5)
=20X1/2+20X1/5
=10+4
=14追问
=20X(3/4+1/5-1/4)
=20X(2/4+1/5)
=20X1/2+20X1/5
=10+4
=14追问
9/13×0.4+2/5×4/13＝多少
(5/6÷5-1/10)×(1-1/4)＝多少
本回答被提问者采纳
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