Question

72-х=18*3
х/8=130+270
400/х=1000/100
х-290=470+230
х+320=90*8
15*х=630/7
если можно то подробно

Answer 1

1)
72 - х = 18 * 3
- х = 54 - 72
- х = - 18
х = 18
4)
х - 290 = 470 + 230
х = 700 + 290
х = 990
5)
х + 320 = 90 * 8
х = 720 - 320
х = 400

Answer 2

1)72-x=18•3
72-x=54
x=72-54
x=18
2)x:8=130+270
x:8=400
x=400•8
x=3200
3)400:x=1000:100
400:x=10
x=400:10
x=40
4)x-290=470+230
x-290=700
x=700+290
x=990
5)x+320=90•8
x+320=720
x=720-320
x=400
6)15•x=630:7
15•x=90
x=90:15
x=6