Question

解方程 2.8x4-5x=5.8 1.6x+2.4=7.2 3.4x-6=4.2 7.8x+5=44

Answer 1

2.8x4-5x=5.8

11.2-5X=5.8

5X=11.2-5.8

5X=5.4

X=1.08

1.6x+2.4=7.2

解1.6X=7.2-2.4

1.6X=4.8

X=3

3.4x-6=4.2

解3.4X=4.2+6

3.4X=10.2

X=3

7.8x+5=44

解7.8X=44-5

7.8X=39

X=5