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b.
c.
d.
2. a. √63+√112= 3√7 + 4√7 = 7√7
b. √108 - √72 = 6√3 - 6√2
3.a √128 × √200 = 8√2 × 10√2 = 80×2=160
b.
4.a.
b.
5.a.
b.
c. ×