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解方程:35-2.5X=56×2.5+8X=231.2X+1.3X-8=4.6(2.5+X)×1.4=11.9.

题目详情
解方程:
35-2.5X=5
6×2.5+8X=23
1.2X+1.3X-8=4.6          
(2.5+X)×1.4=11.9.
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答案和解析
(1)35-2.5X=5,
    35-2.5X+2.5X=5+2.5X,
          5+2.5X=35,
        5+2.5X-5=35-5,
            2.5X=30,
       2.5X÷2.5=30÷2.5,
               X=12;
(2)6×2.5+8X=23,
         15+8X=23,
      15+8X-15=23-15,
            8X=8,
         8X÷8=8÷8,
             X=1;
(3)1.2X+1.3X-8=4.6,
          2.5X-8=4.6,
        2.5X-8+8=4.6+8,
            2.5X=12.6,
       2.5X÷2.5=12.6÷25,
               X=5.04;
(4)(2.5+X)×1.4=11.9,
           3.5+1.4X=11.9,
       3.5+1.4X-3.5=11.9-3.5,
               1.4X=8.4,
          1.4X÷1.4=8.4÷1.4,
                  X=6.