8.4x+3.6x+3.8=9.8 x÷5+0.5=5.58.4x+3.6x+3.8=9.8 x÷5+0.5=5.5

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8.4x+3.6x+3.8=9.8x÷5+0.5=5.58.4x+3.6x+3.8=9.8x÷5+0.5=5.58.4x+3.6x+3.8=9.8x÷5+0.5=5.58.4x+3.6x+3.8=9.

8.4x+3.6x+3.8=9.8 x÷5+0.5=5.58.4x+3.6x+3.8=9.8 x÷5+0.5=5.5
8.4x+3.6x+3.8=9.8 x÷5+0.5=5.5
8.4x+3.6x+3.8=9.8 x÷5+0.5=5.5

8.4x+3.6x+3.8=9.8 x÷5+0.5=5.58.4x+3.6x+3.8=9.8 x÷5+0.5=5.5
8.4x+3.6x+3.8=9.8
8.4x+3.6x=9.8-3.8
12x=6
x=6/12
x=0.5

x÷5+0.5=5.5
x÷5=5.5-0.5
x÷5=5
x=5*5
x=25

前面的x=0.5 后面的x=25