5.21. Упростите выражение: 1) (a+b)²-(a-b)²; 2) (m+4)²-4(m+1)2; 3) 3(2-y)²+4(y-5)²; 4) 5(3-5x52х-10 5) (a+1)+(a-17-a- 6) (x-1)-4(x+1)-f(x+​
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