解方程.x÷0.4=11 8

解方程.x÷0.4=11 8.2-35x=4 10+4x=15 x-15%x=68 3(x-1)=9 0.5x+6=18.
2024-12-17 06:36:33
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回答1:

(1)x÷0.4=11
    x÷0.4×0.4=11×0.4
              x=4.4;

(2)8.2-

3
5
x=4
 8.2-
3
5
x+
3
5
x=4+
3
5
x
      8.2-4=4+
3
5
x-4
     4.2÷
3
5
=
3
5
x÷
3
5

          x=7;

(3)10+4x=15
  10+4x-10=15-10
     4x÷4=5÷4
         x=1.25;

(4)x-15%x=68
       85%x=68
  85%x÷85%=68÷85%
          x=80;

(5)3(x-1)=9
  3(x-1)÷3=9÷3
        x-1+1=3+1
            x=4;

(6)0.5x+6=18
   0.5x+6-6=18-6
  0.5x÷0.5=12÷0.5
          x=24.