Question

方程：3(X+2)=4(X+1) 9*3-1.7X=13.4 7X-3X=2.042 5(X+3)=20 1.4X-1.

Answer 1

3(X+2)=4(X+1)

3X+6=4X+4

4X-3X=6-4

X=2

9*3-1.7X=13.4

1.7X=27-13.4

1.7X=13.6

X=13.6÷1.7

X=8

7X-3X=2.042

4X=2.042

X=2.042÷4

X=0.5105

5(X+3)=20

X+3=20÷5=4

X=4-3

X=1

1.4X-1.6*5=1.8

1.4X=1.8+8

1.4X=9.8

X=9.8÷1.4

X=7