Question

数学解方程

5(2x-3)+9(10x-8)=113
15(3x-4)=100-35x
43-2(5+3x)=3+6(x-1)
(19-2x)÷5=x+1
15(3x+4)=100-35x

Answer 1

5(2x-3)+9(10x-8)=113
解：
10x-15+90x-72=113
100x=200
x=2

15(3x-4)=100-35x
解：
45x-60=100-35x
80x=160
x=2

43-2(5+3x)=3+6(x-1)
解：
43-10-6x=3+6x-6
36=12x
x=3

(19-2x)÷5=x+1
解：
19-2x=5(x+1)
19-2x=5x+5
14=7x
x=2

15(3x+4)=100-35x
解：
45x+60=100-35x
80x=40
x=0.5

Answer 2

5(2x-3)+9(10x-8)=113
10x+90x-15-72=113
100x=200
x=2

15(3x-4)=100-35x
45x-60=100-35x
45x+35x=100+60
80x=160
x=2

43-2(5+3x)=3+6(x-1)
43-10-6x=3+6x-6
12x=36
x=3

(19-2x)÷5=x+1
19-2x=5(x+1)
19-2x=5x+5
7x=14
x=2

15(3x+4)=100-35x
45x+60=100-35x
45x+35x=100-60
80x=40
x=0.5

Answer 3

5(2x-3)+9(10x-8)=113
100x-87=113
x=2
15(3x-4)=100-35x
45x-60=100-35x
10x=160
x=16
43-2(5+3x)=3+6(x-1)
43-10-6x=3+6x-6
12x=36
x=3
(19-2x)÷5=x+1
19-2x=5x+5
14=7x
x=2
15(3x+4)=100-35x
45x+60=100-35x
80x=40
x=0.5

Answer 4