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If XY + ZW = 139, then & nbsp; X + y + Z + W=______ ．
X + y + Z + W = 9 + 13 = 22
XY + y = YX Q: what is XY (a two digit number)
The original formula = y (x + 1) = YX, then x + 1 = x, 1 = 0. Because 1 is not equal to 0, the original formula can only be equal to 0, so y = 0, X takes any value
Who can solve: (10Y + x) / (x + y) = 8.7 (10x + y) / (10Y + x) = 4.3
①
(10y＋x)/(x＋y)=8.7
8(x+y)+7=10y+x
7x+7=2y
x. If y is a natural number less than 10, then x = 1, y = 7
②
(10x＋y)/(10y＋x)=4.3
4(10y+x)+3=10x+y
13y+1=2x
x. If y is a natural number less than 10, then x = 7 and y = 1
Solve the equation of mathematical talent -- let B row x meters per minute, a row (x + 30) meters per minute, list the equation 1500-5 (x + 30) = 5x
Right now!
The final solution is x = 135!
1500-5x-150=5x
1350-5x=5x
1350=10x
x=135
X-0.5x = 165 (x + 2.5) = 30 is solved by equation
x-0.5x=16 0.5x=16
x=32
5（x+2.5）=30
5x+12.5=30 5x=17.5 x＝3.5
How to solve the equation 5x = 3 (x + 4)
5x = 3x +12
5x -3x =12
2x =12
x =6
5x+x=14
5x+x=14
(5+1)x=14
6x=14
x=14/6
x=7/3
5x minus two-thirds equals four-thirds. Solve the equation
5x minus two-thirds is four-thirds,
5x-2/3=4/3
5x=2
x=2/5
How to solve 9x = 5x + 18.6
9x=5x+18.6
9x-5x=5x+18.6-5x
4x=18.6
4x÷4=18.6÷4
x=4.65
2/5x-5/9x=21
2/5x-5/9x=21
(2/5-5/9)x=21
(18-25)/45 x=21
-7/45 x =21
So x = 21 / (- 7 / 45) = - 135
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