Упростите выражения:
2) -9c^2+(3c+d)^2-d^2
4) (7b-t)(t+7b)+(7b+t)^2
6) (11c+3)^2-2c(5,5c+33)
2) -9c^2+(3c+d)^2-d^2
4) (7b-t)(t+7b)+(7b+t)^2
6) (11c+3)^2-2c(5,5c+33)
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Answers & Comments
2)= -9с²+9с²+d²-d²=0
4)= (7b-t)(7b+t)+49b²+t²=49b²-t²+49b²+t²=98b²
6) =121c²+9-(11c²+66c)=121c²+9-11c²-66c=110c²+9-66c