1)(x+2-x+2)(x+2+x-2)/(6y-30-3y+30)=4*2x/3y=8x/3y
2)(ab+3a-ab+4b)/(a²-2ab+b²+2ab)=(3a+4b)/(a²+b²)
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а) 4c(a-c)+7c(a-c)= (а -с)(4с +7с)</span>
<span /><span>б) xz+yz+5x+5y = z(x +y) +5(x +y) = ( x + y)(z + 5)
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№1. 4a² + 4ab + b² = (2a + b)²
№2. (1) ab - ac + 2c - 2b - b + c = ab - ac + 3c - 3b = a(b - c) - 3(b - c) = (b - c)(a - 3)
(2) 3a² - 6ab + 3b² = (a√3)² - 2 × a√3 × b√3 + (b√3)² = (a√3 - b√3)²
[ИЛИ]
3a² - 6ab + 3b² = 3(a² - 2ab + b²) = 3(a - b)²