Упрастите выражение1) 3 6/7 х-7/9 х+44/63 х; 3) 4 2/9y + 3 1/5y-2y 4) 5 3/10x-2 7/100x-2/25

1) 3 6/7 х - 7/9 х + 44/63 х = x (3 6/7 - 7/9 + 44/63) = x ((3 * 7 + 6) / 7 - 7/9 + 44/63) =

x (27/7 - 7/9 + 44/63) = x ((27 * 9) / 63 - (7 * 7) / 63 + 44/63) = x (243/63 - 49/63 + 44/63) =

x (243 - 49 + 44) / 63 = x * 238/63 = x * 3 49/63.

2) 4 2/9y + 3 1/5y - 2y = y (4 2/9 + 3 1/5 - 2) = y ((4 * 9 + 2) / 9 + (3 * 5 + 1) / 5 - 2) =

y (38/9 + 16/5 - 2) = y ((38 * 5) / 40 + (16 * 9) / 40 - 2 * 40/40) = y (190/40 + 144/40 - 80/40) =

y (190 + 144 - 80) / 40 = y * 254/40 = 6.35y.

3) 5 3/10x - 2 7/100x - 2/25x = x (5 3/10 - 2 7/100 - 2/25) = x ((5 * 10 + 3) / 10 -

(2 * 100 + 7) / 100 - 2/25) = x (53/10 - 207/100 - 2/25) = x ((53 * 10) / 100 - 207/100 - (2 * 4) / 100) =

x (530/100 - 207/100 - 8/100) = x (530 - 207 - 8) / 100 = x * 315/100 = 3.15x.