√ (10 / 4х-58) = 1/7,
(√ (10 / 4х-58) )² = (1/7)²,
10 / (4х-58) = 1/49,
4х-58 = 49*10,
4х-58 = 490,
4х = 490+58,
4х = 548,
х = 548 : 4,
х = 137,
проверка:
√ (10 / 4*137 - 58) = 1/7,
√ (10 / 490) = 1/7,
√ (1/49) = 1/7,
1/7 = 1/7
1) 5 4/7-5 = 4/7.
2) 13 18/25-10 = 3 18/25.
3) 27 6/53-19 = 8 6/53.
4) 61 24/79-58 = 3 24/79.
5) 141 89/90-84 = 57 89/90.
6) 203 64/77-189 = 14 64/77.
Подбирать долго)
х=-2-4у
2(-2-4у)-6у=3
-4-8у-6у=3
-14у=7
у=-0,5
<span>х=0</span>