计算:(1)(3又根号2+根号48)(根号18减4又根号3)(2)(根号a+根号b)^2-(根号a-根号b)^2
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![计算:(1)(3又根号2+根号48)(根号18减4又根号3)(2)(根号a+根号b)^2-(根号a-根号b)^2](/uploads/image/z/608857-25-7.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%9A%EF%BC%881%EF%BC%89%EF%BC%883%E5%8F%88%E6%A0%B9%E5%8F%B72%2B%E6%A0%B9%E5%8F%B748%EF%BC%89%EF%BC%88%E6%A0%B9%E5%8F%B718%E5%87%8F4%E5%8F%88%E6%A0%B9%E5%8F%B73%EF%BC%89%EF%BC%882%EF%BC%89%EF%BC%88%E6%A0%B9%E5%8F%B7a%2B%E6%A0%B9%E5%8F%B7b%29%5E2-%28%E6%A0%B9%E5%8F%B7a-%E6%A0%B9%E5%8F%B7b%29%5E2)
计算:(1)(3又根号2+根号48)(根号18减4又根号3)(2)(根号a+根号b)^2-(根号a-根号b)^2
计算:(1)(3又根号2+根号48)(根号18减4又根号3)(2)(根号a+根号b)^2-(根号a-根号b)^2
计算:(1)(3又根号2+根号48)(根号18减4又根号3)(2)(根号a+根号b)^2-(根号a-根号b)^2
(3√2+√48)(√18-4√3)
=(3√2+4√3)(3√2-4√3)
=18-12√6+12√6-48
=-30
(√a+√b)^2-(√a-√b)^2
=(√a+√b+√a-√b)(√a+√b-√a+√b)
=(2√a)*(2√b)
=4√(ab)