1) 5/9х = 1 1/3 2) 2 1/14 - 1 2/3х = 1 5/21
5/9х = 4/3 1 2/3х = 2 1/14 - 1 5/21
х = 4/3 : 5/9 1 2/3х = 2 3/42 - 1 10/42
х = 4/3 · 9/5 1 2/3х = 1 45/42 - 1 10/42
х = (4·3)/(1·5) 1 2/3х = 35/42 = 5/6
х = 12/5 5/3х = 5/6
х = 2 целых 2/5 х = 5/6 : 5/3
х = 5/6 · 3/5 = (1·1)/(2·1)
х = 1/2
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3) (8/15 + 2/9у) : 3/5 = 2 4) 2/5m + 3/10 - 2/15m = 1/6
8/15 + 2/9у = 2 · 3/5 6/15m - 2/15m = 1/6 - 3/10
8/15 + 2/9у = 6/5 4/15m = 5/30 - 9/30
2/9у = 6/5 - 8/15 4/15m = -4/30 = -2/15
2/9у = 18/15 - 8/15 m = -2/15 : 4/15
2/9у = 10/15 = 2/3 m = -2/15 · 15/4 = -2/4
у = 2/3 : 2/9 m = -1/2
у = 2/3 · 9/2 = 9/3
у = 3
x=420:2:2
x=105
б) x+2=420:35
x+2=12
x=10
в) x*35:2=420
x*35=420*2
x*35=840
x=840:35
x=24