Question

Математика 3 и 4 5 класс

Answer 1

3)9х+6х-15=615;
15х=600
х=40
4)2х+123х+97=472
125х=375
х=3

Answer 2

3) 9х+6х=615+15
15х=630
х=630:15
х=42
4) 2х+123х=472-97
125х=375
х=375: 125
х=3