问题 解答题
解方程:
x+3.2=10.83x÷13=209x-36=5x
2.5×3-2x=0.54(2-x)=1x÷1.7-0.8=6.
答案

(1)x+3.2=10.83,

     x+3.2-3.2=10.83-3.2,

             x=7.63;

(2)x÷13=20,

 x÷13×13=20×13,

         x=260;

(3)9x-36-5x=5x-5x,

        4x-36=0,

     4x-36+36=0+36,

           4x=36,

        4x÷4=36÷4,

            x=9;

(4)2.5×3-2x=0.5,

        7.5-2x=0.5,

     7.5-2x+2x=0.5+2x,

        0.5+2x=7.5,

    0.5+2x-0.5=7.5-0.5,

            2x=7,

         2x÷2=7÷2,

             x=3.5;

(5)4(2-x)=1,

         8-4x=1,

      8-4x+4x=1+4x,

         1+4x=8,

       1+4x-1=8-1,

           4x=7,

        4x÷4=7÷4,

            x=

7
4

(6)x÷1.7-0.8=6,

 x÷1.7-0.8+0.8=6+0.8,

         x÷1.7=6.8,

    x÷1.7×1.7=6.8×1.7,

              x=11.56.

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