23/4x40%+0.4x4.25
=5.75x0.4+0.4x4.25
=0.4x(5.75+4.25)
=0.4x10
=4
2*(x-0.7)=4.8
x-0.7=2.4
x=3.1
1/8*(x+0.5)=75%
x+0.5=600%
x+0.5=6
x=5.5
19-12%x=7
12%x=12
x=100
5/12x4/7x48x28
=(5/12x48) x (4/7x28)
=20x16
=320
102x12/25
=(100+2)x12/25
=100x12/25+2x12/25
=48+24/25
= 48.96
36x3/4+3/4x63+3/4
=3/4x(36+63+1)
=3/4x100
=75
20-35x(2/5-1/7)
=20-(35x2/5-35x1/7)
=20-14+5
=11
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追问谢谢啦·等会儿就采纳~
追答不用谢。。
追问这是最后一个了~
7/10÷(1-75%x40%)
追答7/10÷(1-75%x40%)
=7/10÷(1-0.3)
=0.7÷0.7
=1
本回答被提问者采纳