Ответ:
1)y+7y=24
8y=24
y=24:8
y=3
3×7=21
2)a+8a=36
9a=36
a=36:9
a=4
4×8=32
3)x+9x=90
10x=90
x=9
9×9=81
4)b+7b=64
8b=64
b=64:8
b=8
8×7=56
5)d+10d=121
11d=121
d=121:11
d=11
11×10=110
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Ответ:
1)y+7y=24
8y=24
y=24:8
y=3
3×7=21
2)a+8a=36
9a=36
a=36:9
a=4
4×8=32
3)x+9x=90
10x=90
x=9
9×9=81
4)b+7b=64
8b=64
b=64:8
b=8
8×7=56
5)d+10d=121
11d=121
d=121:11
d=11
11×10=110