Exercise57

Simplify the following expressions if possible.

1) \(\displaystyle{ {3r^{2}+2r^{2}}=}\)

2) \(\displaystyle{ (3r^{2})(3r^{2})=}\)

3) \(\displaystyle{ {3r^{2}-r}=}\)

4) \(\displaystyle{ (3r^{2})(-r)=}\)

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