(b+2)/(b(b+3))-(1+b)/((b-3)(b+3)) = 7/40 - 6/16 = (112 - 240)/640 = -128/640 = -34/160 = -17/80
1) y=6*-2 + 4; y=-12 + 4; y=-8
y= 6*0 + 4; y=4
2) 1*4= 6x +4; 4=6x+4; x=0
1*10= 6x +4; 6=6x; x=1
( √x - 5 )/( √x + 1 ) = ( √x + 4 ) / ( √ x - 8 )
( √x - 5 )( √x - 8 ) = ( √x + 4 )( √x + 1 )
x - 8√x - 5√x + 40 = x + √x + 4√x + 4
x - 13√x + 40 = x + 5√x + 4
- 13√x + 40 = 5√x + 4
18√x = 36
√x = 2
x = 4
Ответ 4
1
5/8x-1/4x+1/12y+1/3y=5/8x-2/8x+1/12y+4/12y=3/8x+5/12y
2
9,4y+2x-11,25y-3 5/9x=-1 5/9x-1,85y
3
2 1/6y-7x+1 3/4+2 1/5x=2 1/6y-4 4/5x+1 3/4
4
3,5x+6 1/4y-7x-7y=-3,5x-3/4y