решите номер через пропорцию
а)x\9=5\9
б)5\x=0.2\3
в)6x\5=18\7
г)7,5:(2x)=3:0.8
д)x-3\5=4\7
е)x+1\3=x-1\2
Вот пример:
x\9=5\9
9x=5*9
9x=45
x=45:9
x=5
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