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第一题看不清楚
x+3/7x=5/14
10/7x=5/14
x=5/14*7/10
x=1/4
2/3:3/2=x:1/2
3/2x=1/2*2/3
3/2x=2/6
x=2/6*2/3
x=2/9
24*(1/2-1/3)除以1/7
=[24*1/2-24*1/3]除以1/7
=[12-8]除以1/7
=5除以1/7
=35
(8/5+1/2)除以7/3-9/10
=(16/10+5/10)除以7/3-9/10
=21/10除以7/3-9/10
=21/10*3/7-9/10
=9/10-9/10
=0
36*1/4+17*1/4+47*25%
=(36+17+47)*1/4
=100*1/4
=20
18.5除以1.25除以0.8-10.5
=18.5除以(1.25*0.8)-10.5
=18.5除以1-10.5
=18.5-10.5
=8
(2.25*2.7*5.1)除以(8.1*0.25*1.7)
=30.9825除以3.4425
=9
x+3/7x=5/14
10/7x=5/14
x=5/14*7/10
x=1/4
2/3:3/2=x:1/2
3/2x=1/2*2/3
3/2x=2/6
x=2/6*2/3
x=2/9
24*(1/2-1/3)除以1/7
=[24*1/2-24*1/3]除以1/7
=[12-8]除以1/7
=5除以1/7
=35
(8/5+1/2)除以7/3-9/10
=(16/10+5/10)除以7/3-9/10
=21/10除以7/3-9/10
=21/10*3/7-9/10
=9/10-9/10
=0
36*1/4+17*1/4+47*25%
=(36+17+47)*1/4
=100*1/4
=20
18.5除以1.25除以0.8-10.5
=18.5除以(1.25*0.8)-10.5
=18.5除以1-10.5
=18.5-10.5
=8
(2.25*2.7*5.1)除以(8.1*0.25*1.7)
=30.9825除以3.4425
=9
追问
百分之20比30分之3=4.5分之x
追答
20%:3/30=x/4.5
0.1x=4.5*0.2
0.1x=0.9
x=9
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