7 (4-3х)-(8,5-х)=4-3 (х-8)
28-21х-8,5+х=4-3х-24
3х-21х+х=-28+4+8,5-24
-17х=-39,5
х=2,3235294118
Б(2;-3) (2х-у+1)(2*-3+6)=(2х-у+1) * 0 =<span> 0. </span>
г)(1;3) (2*1-3+1)(xy+6)= 0 * (ху+6) = 0.
12/7 = 1 5/7.
25/4 = 6 1/4 = 6,25.
123/12 = 10 3/12= 10 1/4 = 10,25.
256/26 = 9 22/26 = 9 11/13.
Удачи))))
Решите уравнение.
2y²-50y=75-3y
2y²-50y+3y-75=0
2y²-47y-75=0
D=2209+600=2809
y₁=_47+53_=_100_=25.
4 4
y₂=_47-53_= - _6_= -3.
2 2