Question

Решите уравнения:
а) -1,7х + 0,7=-4,4 б)0,4(3х-1)=3,2

Answer 1

Объяснение:

а) -1,7х + 0,7=-4,4; -1,7х=-5,1;  х=3

б) 0,4(3х-1)=3,2; 1,2х-0,4=3,2;  1,2х=3,6; х=3

Answer 2

а) $- 1.7x + 0.7 = - 4.4 \\ - 1.7 x = - 4.4 - 0.7 \\ - 1.7x = - 5.1 \\ x = \frac{ - 5.1}{ - 1.7 } \\ x = \fbox{3}\\ ------- \\ - 1.7 \times 3 + 0.7 = - 4.4 \\ - 5.1 + 0.7 = - 4.4 \\ - 4.4 = - 4.1$

б) $0.4 (3x - 1) = 3.2 \\ 1.2x - 0.4 = 3.2 \\ 1.2x = 3.2 +0.4 \\ 1.2x = 3.6 \\ x = \frac{3.6}{1.2 } \\ x =\fbox{ 3 }\\ - - - - - - - - - \\ 0.4(3 \times 3 - 1) = 3.2 \\ 3.6 - 0.4 = 3.2 \\ 3.2 = 3.2$