Решите срочно11111111111114444. Created by fair1214. algebra-ru

Решите срочно11111111111114444...

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$1)\; \; (2a^2-3a+1)-(7a^2-5a)=-5a^2+2a+1\\\\3x(4x^2-x)=12x^3-3x^2\\\\2)\; \; 2xy-3xy^2=xy(2-3y)\\\\8b^4+2b^3=2b^3(4b+1)\\\\3)\; \; 7-4(3x-1)=5(1-2x)\\\\7-12x+4=5-10x\\\\11-5=12x-10x\\\\2x=6\\\\x=3\\\\4)\; \; (x-2)+x+(x+3)=91\\\\3x+1=91\\\\3x=90\\\\x=30\; \; ;\; \; x-2=28\; \; ;\; \; x+3=33$

В 6"А" классе 28 уч., в 6"Б" классе 30 уч., в 6"В" классе 33 ученика.

$5)\; \; \frac{x-1}{5}=\frac{5-x}{2}+\frac{3x}{4}\; \Big |\cdot 20\\\\4(x-1)=10(5-x)+15x\\\\4x-4=50-10x+15x\\\\x=-54\\\\6)\; \; 3x(x+y+c)-3y(x-y-c)-3c(x+y-c)=\\\\=3(x^2+xy+xc-xy+y^2+yc-xc-yc+c^2)=\\\\=3(x^2+y^2+c^2)$

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