题目内容

3x+11=77 3(3x+6)=27
(x+6)÷6=8 6x-15=x
15x+36-5x=108 9x+9=15x.
(1)3x+11=77,
     3x+11-11=77-11,
        3x÷3=66÷3,
            x=22;

(2)3(3x+6)=27,
  3(3x+6)÷3=27÷3,
       3x+6-6=9-6,
        3x÷3=3÷3,
            x=1;

(3)(x+6)÷6=8,
  (x+6)÷6×6=8×6,
         x+6-6=48-6,
             x=42;

(4)6x-15=x,
  6x-15+15=x+15,
      6x-x=x+15-x,
     5x÷5=15÷5,
         x=3;

(5)15x+36-5x=108,
     10x+36-36=108-36,
       10x÷10=72÷10,
             x=7.2;

(6)9x+9=15x,
  9x+9-9x=15x-9x,
     9÷6=6x÷6,
        x=1.5.
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