Zapisz najprościej:
a) 2a(b-3)-2b(a-3)
b) a(a+b)+a(a-b)+b(b+a)
c) 5a(a-2)+2a (a+5)
d) 3(a+2b-3c) -2 (a-2a)+5(c-B)
a) 2a(b-3)-2b(a-3) = 2ab-6a-2ab+6b=-6a+6b
b) a(a+b)+a(a-b)+b(b+a) = a²+ab+a²-ab+b²+ab=2a²+b²+ab
c) 5a(a-2)+2a (a+5) = 5a²-10a+2a²+10a=7a²
d) 3(a+2b-3c) -2 (a-2a)+5(c-b) = 3a+6b-9c-2a+4a+5c-5b=5a+b-4c
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a) 2a(b-3)-2b(a-3) = 2ab-6a-2ab+6b=-6a+6b
b) a(a+b)+a(a-b)+b(b+a) = a²+ab+a²-ab+b²+ab=2a²+b²+ab
c) 5a(a-2)+2a (a+5) = 5a²-10a+2a²+10a=7a²
d) 3(a+2b-3c) -2 (a-2a)+5(c-b) = 3a+6b-9c-2a+4a+5c-5b=5a+b-4c