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化简题~9乘49的平方根、...化简~

题目详情
化简题~9乘49的平方根、...化简~
▼优质解答
答案和解析
(1)原式=√(9×49)
=√9×√49
=3×7
=21
(2)原式=√(16×7)
=√16×√7
=4×√7
=4√7
(3)原式=√(12/25)
=√4×√3×√(1/25)
=2√3×1/5
=(2√3)/5
(4)原式=√27
=√9×√3
=3×√3
=3√3
(5)原式=√18
=√9×√2
=3×√2
=3√2
(6)原式=√(3/13)
=√(3×13/13²)
=√(3×13)×√(1/13)²
=√39×1/13
=(√39)/13
(7)原式=√(9/50)
=√(9×2/100)
=√9×√2×√(1/100)
=3×√2×1/10
=(3√2)/10
(8)原式=1/√2
=√2/√2²
=(√2)/2