Solve the equation (2x + y + Z = 15, x + 2Y + Z = 16, x + y + 2Z = 17)

Solve the equation (2x + y + Z = 15, x + 2Y + Z = 16, x + y + 2Z = 17)

（1）2x＋y＋z＝15
(2) X + 2Y + Z = 16 × 2 get (5) 2x + 4Y + 2Z = 32 and (1) subtract to get (6)
(3) X + y + 2Z = 17 minus (2) to get (4)
（4）-y+z=1
(6) 3Y + Z = 17 minus (4)
4y=16
y=4
z=5
x=3

X plus 3.5 equals 10.8

The method of solving the equation x + 3.5 = 10.8x = 10.8-3.5x = 7.3

IQ question 1 10 1 2 1, 3 10 4 is also equal to 1, and 2 10 1 is also equal to 1. Another 5 10 7 is also equal to 1, right? Reason

Yes, one day + one night = one day, three days + four days = one week, two months + one month = one quarter, five months + seven months = one year

Two times three equals five

x/2*x/3=5
6 / 6 x square = 5
The square of x = 30
X = root 30

Solving equation X-1 / 3, 1 / 2 / 5

x-1/3=1/5
x=1/3+1/5
x=5/15+3/15
x=8/15

Solving equation x-3 / 4 = 1 / 2

X-3 / 4 = 1 / 2
X = 1 / 2 + 3 / 4
X = 5 / 4 = 1.25

Solve equation 1, x + 5 of X + 2 = 1.6 + 2 of X-12, 0.3 of 0.4 (x-3) - 0.04 of 0.1 x-0.2 = 1-2 of X-1
For a project, Party A will complete it in 20 days, Party B will complete it in 30 days, Party A will complete it in 5 days, and the rest will be completed by Party A and Party B in a few days?

1. X + 5 of X + 2 = 1.6 + 2 of X-1
x+(x+2)/5=1.6+(x-1)/2
10x+2x+4=16+5x-5
12x+4=5x+11
7x=7
x=1
2. 0.4 (x-3) of 0.3-0.1 x-0.2 of 0.04 = X-1 of 1-2
0.4(x-3)/0.3-(0.1x-0.2)/0.04=1-(x-1)/2
4/3x-10-2.5x+5=1-1/2x+1/2
(4/3-2.5+1/2)x=1+1/2+10-5
-2/3x=13/2
x=-13/2*3/2
x=-39/4
The efficiency of a is 1 / 20. The efficiency of B is 1 / 30
(1-5*1/20)/(1/20+1/30)
=(3/4)/(1/12)
=3/4*12
=9
9 days later

Solution equation (0.1 x + 0.2) / 0.02 - (x-1) / 0.5 = 3

Because a number divided by 0.02 is multiplied by 50, and a number divided by 0.5 is multiplied by 2
So the original equation becomes:
50(0.1x+0.2)-2(x-1)=3
5x+10-2x+2=3
5x-2x+10+2=3
3x+12=3
3x+12-12=3-12
3x=-9
x=-3
If you are welcome to ask questions, please remember to adopt them.:)

X-5 / 1 x = 10 / 3 (solving the equation)

1 out of 5 x = 3 out of 10
4X out of 5 = 3 out of 10
X = 3 / 10 times 5 / 4
X = 3 / 8

1.1 x + 2.6 = 3.2 × 1.5

1.1x+2.6＝3.2×1.5
1.1x+2.6＝4.8
1.1x＝4.8-2.6
x＝2.2÷1.1
x＝2