<span> (4x-3y)(x+2y)+2x(x+2y)=(4x-3y+2x)(x+2y)=3(2x-y)(x+2y)
5a(3a-b)+(b-3a)(5а+2b);= (b-3a)(-5a+5a+2b)=2b(b-3a)
(a+b)(x-y)+(b-a)(y-x);= (x-y)(a+b-b+a)=2a(x-y)
(2a+7b)(a-5b)-(8b-3a)(a-5b)= (a-5b)(2a+7b-8b+3a)=(a-5b)(5a-b)</span>
<span>9,14 x - (3,78x+2,87x)=12,45
</span><span>9,14 x - 6,65x=12,45
</span><span>2,49x=12,45
</span>х=12,45/2,49
х=5
Х+1=0 или х-1=0
х=-1 х=1
(Так и пишется со словом или)
(y+3)³=y³+9y²+27y+27
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