解方程:7(X+6)-56=56 12.7+18÷X=15.


解方程:7(X+6)-56=56 12.7+18÷X=15.7.
(禅羡裤1)7(X+6)-56=56,
            7x+42-56=56,
            7x-14+14=56+14,
                  7x=70,
    派乎           7x÷7=70÷7,
                   x=10;

(2)12.7+18÷X=15.7,
12.7+18÷X-12.7=15.7-12.7,
          18÷x=3,
 贺简      18÷x×x=3×x,
          18÷3=3x÷3,
              x=6.