8.5 times 3 / 4 plus 3 / 4 times 5 is like 6.5 times 3 / 4

8.5 times 3 / 4 plus 3 / 4 times 5 is like 6.5 times 3 / 4

(8.5+5+6.5)*3/4=20*3/4=15

98.6 times 100

98.6×100.1
=98.6×100+98.6×0.1
=9860+9.86
=9869.86

2 times 1 / 4 + 4 times 1 / 6 +. + 98 times 1 / 100

1/n(n+2)=1/2[1/n-1/(n+2)]
1/2*4+1/4*6+…… +1/98*100
=1/2(1/2-1/4+1/4-1/6+1/6-1/8+…… +1/98-1/100)
=1/2(1/2-1/100)
=1/2*49/100
=49/200

5x-1 / 4 = 3x / 2 + 2-x / 1-3 use the method of removing denominator to solve and write the process

5x-1 / 4 = 3x / 2 + 2-x / 1-3
15x-12=18x+12-8-12x
9x=16
x=16/9

2X + 1 / 3-5x-1 / 6 = 1 (in fractional form)

3. (2x + 4) - 6. (3x-2) = 7 multiplied by (2x + 5) (5x-7) at the same time, we get: 8 (2x-0) - 7 (2x + 8) = (2x + 4) (8x-3) 03x-2-22x-8 = 40x2 + 2x-1 80X2 = - 20 x2 = - 0, there is no J real number solution
N "O"

5 / 4 X-7 - 3 / 8 x = 1 to denominator or something, to format

5 / 4 X-7 - 3 / 8 x = 1
2(5x-7) -3x=8
10x-14-3x=8
7x=22
x=22/7

How to solve 3 / 5x + y = 10?

X = 10, y = 7, it's just a case!

x+y=50 1.5x+1.1y=50

x+y=50 (1)
1.5x+1.1y=50 (2)
(2)-(1)×1.1
1.5x-1.1x=50-55
0.4x=-5
x=-12.5
y=50-x=62.5

Solve the equations 3 / 5x-30 = y 3 / 4 (X-10) = y + 10
Beg on your knees. Come on

3/5x-30=y
3/4(x-10)=y+10
3x-5y=150
3x-4y=70
-4y-(-5y)=70-150
y=-80
x=(70+4y)/3=[70+4×(-8-250/30]/3=-250/3

10x+2x*[(50-x)/2]+5x[(50-x)/2]=240

10x+2x*[(50-x)/2]+5x[(50-x)/2]=240
It is reduced to 7x ^ 2-370x + 480 = 0
Using the root formula X1 = [- B + (b ^ 2-4ac) ^ 1 / 2] / 2A
x2=[-b-(b^2-4ac)^1/2]/2a
The conclusion is: X1 = 51.5, X2 = 1.4