Ответ:
2(4х+3х)=84
7х=84÷2
7х=42
х=6
а=4×6=24
в=3×6=18
S=24×18=432
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Ответ:
2(4х+3х)=84
7х=84÷2
7х=42
х=6
а=4×6=24
в=3×6=18
S=24×18=432