解方程 4（0.3+x）=4.8 4x+3x=0.35 （7-1.4）x=2.8 2x+32.8=57.4．

Question

如题所述

Answer 1

（1）4（0.3+x）=4.8
     4（0.3+x）÷4=4.8÷4
                 0.3+x=1.2
           0.3+x-0.3=1.2-0.3
                       x=0.9

（2）4x+3x=0.35
    （4+3）x=0.35
               7x=0.35
           7x÷7=0.35÷7
                x=0.05

（3）（7-1.4）x=2.8
                  5.6x=2.8
            5.6x÷5.6=2.8÷5.6
                       x=0.5

（4）2x+32.8=57.4
 2x+32.8-32.8=57.4-32.8
                 2x=24.6
             2x÷2=24.6÷2
                   x=12.3