Question

Решить уравнение 7(1.4x+1.8)-27.6=10.1x 0.3(5x-7)=3(0.2x+3.2) 2(1.2x+3.7)-2.8=5.2x

Answer 1

7(1.4x+1.8)-27.6=10.1x
9,8x+12,6-27,6=10,1x
9,8x-15=10,1x
10,1x-9,8x=-15
0,3x=-15
x=-15:0,3
x=-50

0.3(5x-7)=3(0.2x+3.2)
1,5x-2,1=0,6x+9,6
1,5x-0,6x=9,6+2,1
0,9x=11,7
x=11,7:0,9
x=13

2(1.2x+3.7)-2.8=5.2x
2,4x+7,4-2,8=5,2x
2,4x+4,6=5,2x
5,2x-2,4x=4,6
2,8x=4,6
x=4,6:2,8
x=$1 \frac{9}{14}$

Answer 2

7(1.4x+1.8)-27.6=10.1x
9,8x+12,6-27,6=10,1x
9,8x-15=10,1x
10,1x-9,8x=-15
0,3x=-15
x=-15:0,3
x=-50

0.3(5x-7)=3(0.2x+3.2)
1,5x-2,1=0,6x+9,6
1,5x-0,6x=9,6+2,1
0,9x=11,7
x=11,7:0,9
x=13

2(1.2x+3.7)-2.8=5.2x
2,4x+7,4-2,8=5,2x
2,4x+4,6=5,2x
5,2x-2,4x=4,6
2,8x=4,6
x=4,6:2,8
x=$1 \frac{9}{14}$