①
②
③ =3:2
0.8x+0.7=7.9 :x=0.6:
3.5x+0.8=2.2
7x+3×16=69 8:x=4:0.8
①x+ x=27
② =
①x+5x=624
③2.5x-4.5=5.5
①0.7x-4=80
②x- x=4
③ ÷ x=
④x:1.2=
(x-4.5)=7
x=( )
X=(用小数表示)
x+ x=6
x=( )
12x+1.5=5.1
:x=3:12
① ②
①1.5x-2.8=4.7
③12: =
x﹣ =
x+ x=
x:2.1=0.4:0.9.