<span>(4x-3y)²-(2x-y)(2x+y)=16х²-24ху+9у²-4х²+у²=12х²+10у²-24ху
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8y²-2y³-4+y=2у²(4-у)-(4-у)=(4-у)(2у²-1)
</span>
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4a²+20ab+25b²=(2а+5в)²=(2а+5в)(2а+5в)</span>
√(15*3*20)=√900=30
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2х+15 = 3х-11
2х-3х= -11 -15
-х=-26
х=26
2(х-3)=3(2-х)
2х-6=6-3х
2х+3х=6+6
5х=12
х=2,4
-3(4-х)=2(х-5)
-12 + 3х = 2х - 10
3х - 2х = -10 + 12
х = 2