解下列方程.①3x-4×6.5=7.6 &nbs...

2025-06-28 08:25:08
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回答1:

(1)3x-4×6.5=7.6
            3x-26=7.6
         3x-26+26=7.6+26
               3x=33.6
            3x÷3=33.6÷3
                x=11.2;

(2)x-0.25x=7.5
       0.75x=7.5
 0.75x÷0.75=7.5÷0.75
           x=10;

(3)3(6.5-x)=9.6 
  3(6.5-x)÷3=9.6÷3
          6.5-x=3.2
        6.5-x+x=3.2+x
          3.2+x=6.5
      3.2+x-3.2=6.5-3.2
              x=3.3;

(4)(2x-4.6)÷6=1.8
  (2x-4.6)÷6×6=1.8×6
            2x-4.6=10.8
        2x-4.6+4.6=15.4
                2x=15.4
             2x÷2=15.4÷2
                 x=7.7.