解方程1.(x+3.2)÷3=8 2.(x-0.6)÷0.4=1.2

解方程1.(x+3.2)÷3=8 2.(x-0.6)÷0.4=1.2


1.(x+3.2)÷3=8
x+3.2=24
x=20.8
2.(x-0.6)÷0.4=1.2
x-0.6=0.48
x=1.08



一.解方程3.8+x=6.3


3.8+x=6.3
X=6.3-3.8
=2.5



解方程:4.8+X-2.5=6.3-2.8


X=6.3-2.8-4.8+2.5
X=1.2



解方程x=420-x


x=420-x
2x=420兩邊同時加上x
x=210兩邊同時除以2