解方程3×7+4x=25;   6x+18=48; &nbsp...

解方程3×7+4x=25;   6x+18=48; 6x+x=42; 1.2x-x=0.96.
2024-11-25 16:13:06
推荐回答(1个)
回答1:

(1)3×7+4x=25
          21+4x=25
       21+4x-21=25-21
             4x=4
          4x÷4=4÷4
              x=1;

(2)6x+18=48
  6x+18-18=48-18
        6x=30
     6x÷6=30÷6
         x=5;

(3)6x+x=42
     7x=42
  7x÷7=42÷7
      x=6;

(4)1.2x-x=0.96
     0.2x=0.96
0.2÷0.2x=0.96÷0.2
        x=4.8.