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12×7 - 9√98
84 - 9√49√2
84-9×7√2
84-63√2
b. 6√20(2√10+4√5)
6√4.√5(2√10+4√5)
12√5(210+4√5)
24√50 + 48×5
24√25√2+240
24.5√2 + 240
120√2+240
c.4√18(6√2-3√8+√2)
4√9√2 (7√2-3√8)
12√2 (7√2-3√8)
168-36√16
168-36×4
168-136
32