А)
3/5 * x = 2/7 : 1 2/3
3/(5*x)=2/7 : 5/3
3/(5*x)=2*3/(7*5)
3/(5*x)=6/35
5x=6*3/35
x=6*3*5/35
x=90/35
x=6*(3/7)
б)
3/7 : y= 3/8 : 2*(1/3)
3/(7y)=3/8 : 7/3
3/(7y) = 3*3/(7*8)
7y=3*7*8/(3*3)
y=3*7*8/3*3*7
y=8/3
Смотри:
1)
x xz
-------- = ----------
y y
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z
2)
x
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y x
------- = ----------
z zy