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24.dg menggunakan sifat perkalian sekawan, maka diperoleh:3/√a-2√b=3(√a+2√b)/(√a-2√b)(√a+2√b)
=3√a+3×2√b/a-4b
=3√a+6√b/a-4b.
25.√ 14+2√24=√ (2+12)+2√2×12
=√2+√12
bukti:
√ (2+12)+2√2×12=√2+√12
(2+12)+2√2×12=(√2+√12)²
(2+12)+2√2×12=(√2+√12)(√2+√12)
(2+12)+2√2×12=√4+√24+√24+√144
(2+12)+2√2×12=2+2√24+12
(2+12)+2√2×12=(2+12)+2√2×12.
semoga bisa membantu...