Объяснение:
3)(5а+b)^2=25a^2+10ab+b^2
4) (a^2+b^2)^2=a^4+2a^2×b^2+b^4
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Объяснение:
3)(5а+b)^2=25a^2+10ab+b^2
4) (a^2+b^2)^2=a^4+2a^2×b^2+b^4