1600: (х+100)=4
x+100=1600÷4
x+100=400
x=400-100
x=300
Проверка:
1600÷(300+100)=4
1600÷400=4
4=4
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1600: (х+100)=4
x+100=1600÷4
x+100=400
x=400-100
x=300
Проверка:
1600÷(300+100)=4
1600÷400=4
4=4
х+100=1600/4
х+100=400
х=400-100
х=300