Question

Решите уравнение: а) 1 5/7 х - 5/9 = 2 4/9; б) у – 2 5/12 = - 3 7/15; в) 0,5(х – 3) = 0,6(4 + х) – 2,6;

Answer 1

А) 1 5/7 х - 5/9 = 2 4/9
12/7x -5/9 = 22/9
12/7x = 22/9 +5/9
12/7x = 3
x = 3:12/7
x = 3*7/12
x = 7/4
x = 1 3/4

б) у – 2 5/12 = - 3 7/15
y = - 52/15+ 29/12
y = -208+ 145/60
y = -63/60
y = - 21/20
y = -1 1/20

в) 0,5(х – 3) = 0,6(4 + х) – 2,6
0,5x - 1,5 = 2,4 + 0,6x - 2,6
0,5x - 0,6x = 1,5+2,4-2,6
-0,1x = 1,3
x = 1,3:(-0,1)
x = -13