9m+8m(5-2m)=9m²-(5m+7)(5m-7)
9m+40m-16m²=9m²-25m³+49
49m-16m²+16m²=49
49m=49
m=1
Ответ: 1
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9m+8m(5-2m)=9m²-(5m+7)(5m-7)
9m+40m-16m²=9m²-25m³+49
49m-16m²+16m²=49
49m=49
m=1
Ответ: 1