1)3x(3x+7)-(3x+1)²=9x²+21x-9x²-6x-1=15x-1
2)(y-2)(y+3)-(y-1)²=y²+3y-2y-6-y²+2y-1=3y-7
3)(p+1)²-(p+2)²=p²+2p+1-p²-4p-4=-2p-3
4)3(2a-5b)²-12(a-b)²=12a²-60ab+75b²-12a²+24ab-12b²=-36ab+63b²
5)(3x²+4)²+(3x²-4)²-2(5-3x²)(5+3x²)=9x^4+24x²+16+9x^4-24x²+16-50+18x²=
=18x^4+18x²-18
595. -4х-4=6, -4х=6-(-4), -4х= 6+4, -4х=10, х=10/(-4), х=-2,5.
594. -5х-9=-6, -5х=-6-(-9), -5х= -6+9, -5х=3, х=3/(-5), х=-0,6
593. -2х-3=1, -2х=1-(-3), -2х=1+3, -2х=4, х=4/(-2), х=-2.
592. 2х+6=8, 2х=8-6, 2х=2, х=2/2, х=1.
591. 2х-10=-3, 2х=-3+10, 2х=7, х=7/2, х=3,5.
590. 4х+10=-10, 4х=-10-10, 4х=-20, х=-20/4, х=-5
589. 2х-7=6, 2х=6-(-7), 2х=6+7 2х=13 х=13/2 х=6,5
588. 5х-9=3 5х=3-(-9), 5х= 3+9, 5х= 12 х=12/5 х=2,4
587. -5х-1=0 -5х=1 х=1/(-5) х=-0,2
586. -4х-7=0 -4х=7 х=7/(-4) х=1,75
585. -4х+10=0 -4х=-10 х=(-10)/(-4) х= 2,5
584. -5х+6=0 -5х=-6 х= (-6)/(-5) х=1,2
583. -3х+9=0 -3х=-9 х=(-9)/(-3) х=3
582. 4х-7=0 4х=7 х=7/4 х=1,75
581. 10х-8=0 10х=8 х=8/10 х=0,8
580 5х-3=0 5х=3 х=3/5 х=0,6
579.2х+5=0 2х=-5 х= -5/2 х=-2,5
578. 6х+18=0 6х=-18 х= -18/6 х=-3
{2x-3y=11 |*(-2)
<span>{4x+5y=-11
{-4x+6y=-22
{4x+5y=-11
11y= -33
y= - 3
x= 1
Ответ: (1; - 3)
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