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1×2×3+2×3×4+3×4×5…… +7 × 8 × 9?

1×2×3+2×3×4+3×4×5…… +7 × 8 × 9?

1×2×3+2×3×4+3×4×5…… +7×8×9
=1/4×7×8×9×10
=1260

How to calculate 15 * 4 / 21 + 8 / 7 / 16

15*4/21+8/7/16=3*5*4/（3*7）+8/（7*16）
=5*4/7+0.5/7
=20/7+0.5/7
=20.5/7
=~3

4 / 7 * (14 / 15 + 15 / 16 * 7 / 8) simple calculation
fast

4/7*14/15+4/7*15/16*7/8
4 / 1 * 2 / 15 + 1 / 1 * 15 / 4 * 1 / 8
=8/15+15/8=（8*8+15*15）/（8*15）
=（64+225）/120=289/120