这几题方程怎么算x÷4/5+1/5=7/109/10X×7.2=72x÷3/4-3/4=0

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这几题方程怎么算x÷4/5+1/5=7/109/10X×7.2=72x÷3/4-3/4=0这几题方程怎么算x÷4/5+1/5=7/109/10X×7.2=72x÷3/4-3/4=0这几题方程怎么算x÷

这几题方程怎么算x÷4/5+1/5=7/109/10X×7.2=72x÷3/4-3/4=0
这几题方程怎么算
x÷4/5+1/5=7/10
9/10X×7.2=72
x÷3/4-3/4=0

这几题方程怎么算x÷4/5+1/5=7/109/10X×7.2=72x÷3/4-3/4=0

X=(7/10-1/5)×4/5
  =2/5

 
X=72/7.2÷9/10
  =100/9

x=3/4×3/4
 =9/16

x=(7/10-1/5)*5/4=5/8
x=(72/7.2)*10/9=100/9
x=1

x=2/5