解下列方程.2x+2.8×2=10.4 5(3.2+x)=45.5 (x-5)÷4.5=6 ...

解下列方程.2x+2.8×2=10.4 5(3.2+x)=45.5 (x-5)÷4.5=6 x-0.35x=1.3.
2025-01-24 20:24:20
推荐回答(1个)
回答1:

(1)2x+2.8×2=10.4 
           2x+5.6=10.4 
       2x+5.6-5.6=10.4-5.6
               2x=4.8
            2x÷2=4.8÷2
                x=2.4

(2)5(3.2+x)=45.5
  5(3.2+x)÷5=45.5÷5
          3.2+x=9.1
      3.2+x-3.2=9.1-3.2
              x=5.9

(3)(x-5)÷4.5=6 
(x-5)÷4.5×4.5=6×4.5
             x-5=27
           x-5+5=27+5
               x=32

(4)x-0.35x=1.3
       0.65x=1.3
 0.65x÷0.65=1.3÷0.65
           x=2