№1 Вычислите: а) 3+(-8); б) -5+(-7); в) -4+(-7)+(+21); г) -30+20+(+15)+(-45) №2 Решите уравнения: а) 12-х=30; б) 55+х=-10;г) Ix+17I= -20; д) I15-xI=25
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