Question

（x+4）÷3=2.5 急急急 解方程

Answer 1

（x+4）÷3=2.5
解：x+4 =2.5×3
X+4=7.5
X=7.5-4
X=3.5

Answer 2

（x+4）÷3=2.5
x+4=2.5 ×3
x+4=7.5
x=7.5-4
x=3.5

Answer 3

（x+4）÷3=2.5
x+4=7.5
x=3.5

Answer 4

（x+4）÷3=2.5
x+4=2.5×3
x+4=7.5
x=7.5-4
x=3.5

追问

麻烦你帮我把这几道也解(完吧 2.8x+x=1.71 30x+15x=22.5 2.8+2x=22.6 22.6-2x=2.8 （0.23-0.19）x 40×4+2x=400 62×2+2x=358 求求你了 谢谢啊

追答

(1) 2.8x+x=1.71
3.8x=1.71
x=1.71÷3.8
x=0.45
(2) 30x+15x=22.5
45x=22.5
x=22.5÷45
x=0.5
(3) 2.8+2x=22.6
2x=22.6-2.8
2x=19.8
x=9.9
(4) 22.6-2x=2.8
2x=22.6-2.8
2x=19.8
x=9.9
(5) ?
(6) 40×4+2x=400
160+2x=400
2x=400-160
2x=240
x=120
(7) 62×2+2x=358
124+2x=358
2x=358-124
2x=234
x=117

Answer 5

X+4=2。5X3
X=2。5X3-4
=3。5