解方程.6x+4x=1.8×48.6-(x+2)=1.8(x-3.8)×0.7=3.361.8×2.5+0.5x=8.5.-数学

题目简介

解方程.6x+4x=1.8×48.6-(x+2)=1.8(x-3.8)×0.7=3.361.8×2.5+0.5x=8.5.-数学

题目详情

解方程.
6x+4x=1.8×4                             8.6-(x+2)=1.8
(x-3.8)×0.7=3.36                        1.8×2.5+0.5x=8.5.
题型:解答题难度:中档来源:不详

答案

(1)6x+4x=1.8×4,
           10x=7.2,
       10x÷10=7.2÷10,
             x=0.72;

(2)8.6-(x+2)=1.8,
 8.6-(x+2)+(x+2)=1.8+(x+2),
                 8.6=x+3.8,
           x+3.8-3.8=8.6-3.8,
                   x=4.8;

(3)(x-3.8)×0.7=3.36,
      0.7x-3.8×0.7=3.36,
          0.7x-2.66=3.36,
     0.7x-2.66+2.66=3.36+2.66,
               0.7x=6.02,
          0.7x÷0.7=6.02÷0.7,
                  x=8.6;

(4)1.8×2.5+0.5x=8.5,
          4.5+0.5x=8.5,
      4.5+0.5x-4.5=8.5-4.5,
              0.5x=4,
         0.5x÷0.5=4÷0.5,
                 x=8.

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