几道数学二次根号算术题
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几道数学二次根号算术题
1.2√ 10 ×(-√ 40)
2.√ 20a ×√ a^3/5(a≥0)
3.√ 0.4 ×√ 3.6
4.√ x × √ xy^2 (x,y≥0)
5.√ 32×2√2
6.1/2(4√ 3 × 8)
1.2√ 10 ×(-√ 40)
2.√ 20a ×√ a^3/5(a≥0)
3.√ 0.4 ×√ 3.6
4.√ x × √ xy^2 (x,y≥0)
5.√ 32×2√2
6.1/2(4√ 3 × 8)
![几道数学二次根号算术题](/uploads/image/z/19023370-34-0.jpg?t=%E5%87%A0%E9%81%93%E6%95%B0%E5%AD%A6%E4%BA%8C%E6%AC%A1%E6%A0%B9%E5%8F%B7%E7%AE%97%E6%9C%AF%E9%A2%98)
1.2√ 10 ×(-√ 40)
=-2√10×2√10
=-40
2.√ 20a ×√ a^3/5(a≥0)
=2√(5a)×a√(a/5)
=2a×√a²
=2a×a
=2a²
3.√ 0.4 ×√ 3.6
=√(0.4×3.6)
=√1.44
=1.2
4.√ x × √ xy^2 (x,y≥0)
=√(xy)²
=xy
5.√ 32×2√2
=4√2×2√2
=8×2
=16
6.1/2(4√ 3 × 8)
=2√3×8
=16√3
=-2√10×2√10
=-40
2.√ 20a ×√ a^3/5(a≥0)
=2√(5a)×a√(a/5)
=2a×√a²
=2a×a
=2a²
3.√ 0.4 ×√ 3.6
=√(0.4×3.6)
=√1.44
=1.2
4.√ x × √ xy^2 (x,y≥0)
=√(xy)²
=xy
5.√ 32×2√2
=4√2×2√2
=8×2
=16
6.1/2(4√ 3 × 8)
=2√3×8
=16√3