Question

15X-2.5=11.5 3(x+2)=39 x-3/5x=6/5 4.9÷7/2-5x=0.8 8/5÷x=16 4x1.25-6x=3.2

写完全对再加分
15X-2.5=11.5 3(x+2)=39 x-3/5x=6/5 4.9÷7/2-5x=0.8 8/5÷x=16 4x1.25-6x=3.2 题目是这样的，是方程啊

Answer 1

15X-2.5=11.5
15X=11.5+2.5
15X=14
X=14/15;

3(x+2)=39
X+2=39/3
X+2=13
X=13-2
X=11

x-(3/5)x=6/5
(5/5-3/5) x=6/5
(2/5)x=6/5
2x=6
x=6/2
x=3

4.9÷7/2-5x=0.8
0.7/2=5x+0.8
5x=0.7/2-0.8
5x=0.35-0.8
x=-0.45/5=-0.09

8/5÷x=16
8/5=16x
x=(8/5)/16 =1/10

4*1.25-6x=3.2 ?
5-6x=3.2
6x=5-3.2
6x=1.8
x=1.8/6=0.3

4X×1.25-6X=3.2
5X-6X=3.2
-X=3.2
X=-3.2

Answer 2

15X-2.5=11.5
15X=11.5+2.5
15X=14
X=14/15;

3(x+2)=39
X+2=39/3
X+2=13
X=13-2
X=11

x-(3/5)x=6/5
(5/5-3/5) x=6/5
(2/5)x=6/5
2x=6
x=6/2
x=3

4.9÷7/2-5x=0.8
0.7/2=5x+0.8
5x=0.7/2-0.8
5x=0.35-0.8
x=-0.45/5=-0.09

8/5÷x=16
8/5=16x
x=(8/5)/16 =1/10

4*1.25-6x=3.2 ?
5-6x=3.2
6x=5-3.2
6x=1.8

Answer 3

x=(11.5+2.5)/25=0.56 x=39/3-2=11 x=6/5÷(1-3/5)=3 x=(0.8-4.9÷7/2)/(-5)=0.12
8/5x=16 x=16*5/8=10 x=(3.2- 4x1.25)/(-6)=0.3

Answer 4

3(x+2)=39