Решите: 1) -4(5-4х)=х+1 2) -4(-7+6х)=-9х-5 - вопрос №952830114541247695 от Leonarda11 24.03.2023 07:41

Question

Алгебра: Решите: 1) -4(5-4х)=х+1 2) -4(-7+6х)=-9х-5

Leonarda11 · Answer

1) -4(5-4х)=х+1-20+16х=х+116х-х=1+2015х=21х=21÷15х=1,4проверка:-4(5-4×1,4)=1,4+1-4(5-5,6)=2,4-20+22,4=2,42,4=2,42) -4(-7+6х)= -9х-528-24х= -9х-5-24х+9х=-5-28-15х= -33х= -33÷(-15)х=2,2проверка:-4(-7+6×2,2)= -9×2,2-5-4(-7+13,2) = -19,8-528-52,8= - 24,8-24,8= -24,8...