解方程(第三个写出检验过程) 8X-3.4X=9.2 X÷2.4=62.4 X-0.95X=1.5 3(X-5)=7.8 16-3X=

2025-03-22 10:44:23
推荐回答(1个)
回答1:

(1)8X-3.4X=9.2,
            4.6x=9.2,
       4.6x÷4.6=9.2÷4.6,
               x=2;

(2)X÷2.4=62.4,
X÷2.4×2.4=62.4×2.4,
          x=149.76;

(3)X-0.95X=1.5,
       0.05x=1.5,
 0.05x÷0.05=1.5÷0.05,
           x=30;
检验:方程的左边=30-30×0.95=30-28.5=1.5=方程的右边,
所以x=30是方程的解.
(4)3(x-5)=7.8,
  3(x-5)÷3=7.8÷3,
          x-5=2.6,
        x-5+5=2.6+5,
            x=7.6;

(5)16-3x=10,
  16-3x+3x=10+3x,
     10+3x=16,
  10+3x-10=16-10,
     3x÷3=6÷3,
         x=2;

(6)2x-0.24=0.12,
2x-0.24+0.24=0.12+0.24,
       2x÷2=0.36÷2,
         x=0.18;

(7)6x-4.8×0.4=5.28,
       6x-1.92=5.28,
  6x-1.92+1.92=5.28+1.92,
             6x=7.2,
          6x÷6=7.2÷6,
              x=1.2;

  ( 8)5-0.9x﹦2.75,
   5-0.9x+0.9x﹦2.75+0.9x,
     2.75+0.9X﹦5,
2.75+0.9X-2.75﹦5-2.75,
     0.9x÷0.9=2.25÷0.9,
             x=2.5;

(9)6x+18=48,
  6x+18-18=48-18,
        6x=30,
     6X÷6=30÷6,
         x=5.