解方程:2.7×2-1.5x=0 13x-6.8x+x=46.8 2.6x-6.5+3.5=10&...

2024-12-26 01:45:07
推荐回答(1个)
回答1:

(1)2.7×2-1.5x=0
           5.4-1.5x=0
      5.4-1.5x+1.5x=0+1.5x
               1.5x=5.4
          1.5x÷1.5=5.4÷1.5
                  x=3.6;

(2)13x-6.8x+x=46.8 
          7.2x=46.8
     7.2x÷7.2=46.8÷7.2
             x=6.5;

(3)2.6x-6.5+3.5=10      
           2.6x-3=10
         2.6x-3+3=10+3
             2.6x=13
        2.6x÷2.6=13÷2.6
                x=5;

(4)2×(x-0.7)=4.8 
  2×(x-0.7)÷2=4.8÷2
           x-0.7=2.4
       x-0.7+0.7=2.4+0.7
               x=3.1;

(5)5.4÷(3.94+0.86)×0.8
=5.4÷4.8×0.8
=1.125×0.8
=0.9.