Calculation: 1 × 2 × 3 + 3 × 6 × 9 + 5 × 10 × 15 + 7 × 14 × 211 × 3 × 5 + 3 × 9 × 15 + 5 × 15 × 25 + 7 × 21 × 35=______ ．

Calculation: 1 × 2 × 3 + 3 × 6 × 9 + 5 × 10 × 15 + 7 × 14 × 211 × 3 × 5 + 3 × 9 × 15 + 5 × 15 × 25 + 7 × 21 × 35=______ ．

1 × 2 × 3 + 3 × 6 × 9 + 5 × 10 × 15 + 7 × 14 × 211 × 3 × 5 + 3 × 9 × 15 + 5 × 15 × 25 + 7 × 21 × 35, = 1 × 2 × 3 + 33 × 1 × 2 × 3 + 53 × 1 × 2 × 3 + 73 × 1 × 2 × 31 × 3 × 5 + 33 × 1 × 3 × 5 + 53 × 1 × 3 × 5 + 73 × 1 × 3 × 5, = 1 × 2 × 3 × (13 + 33 + 53 + 73) 1 × 3 × 5 × (13 + 33 + 53 + 73), = 25

1 / 3 * 5 / 3 + 17 / 5-9 / 5 * 7 / 5 1-7 / 5 * 25 / 21 2 / 1 + 4 / 5 * 5 / 4

1 / 3 * 3 / 5 + 1
=1/5+1
=1 and 1 / 5
5 / 7-5 / 9 * 5 / 7
=5/7×（1-5/9）
=5/7×4/9
=20/63
5 / 1-7 * 21 / 25
=1-3/5
=2/5
1 / 2 + 5 / 4 * 4 / 5
=1/2+1
=1 and 1 / 2

（1）√9×2√3 （2）√16＋√25 （3）8√4-√16 （4）2√7×√21 （5）√15×2√3

Hello
（1）√9×2√3
=3x2√3
=6√3
（2）√16＋√25
=4+5
=9
（3）8√4-√16
=8x2-4
=16-4
=12
（4）2√7×√21
=2√(7x21)
=2√(7x7x3)
=14√3
（5）√15×2√3
=2√45
=2√(9x5)
=6√5
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