(9/15 + 3/10) ÷ 6/5 = (18/30 + 9/30) × 5/6
= 27/30 × 5/6
= (27×5)/(30×6)
= (3×3×3×5)/(3×2×5×3×2)
= 3/(2×2)
= 3/4
12/7 - 4/7 × 35/12 = 12/7 - (4×35)/(7×12)
= 12/7 - (4×7×5)/(7×4×3)
= 12/7 - 5/3
= 36/21 - 35/21
= 1/21
(4/5 + 7/10) ÷ (5/6 - 5/8) = (8/10 + 7/10) ÷ (20/24 - 15/24)
= 15/10 ÷ 5/24
= 15/10 × 24/5
= (15×24)/(10×5)
= (3×5×2×12)/(2×5×5)
= (3×12)/(5)
= 36/5
6/5 + 21/5 ÷ 14/15 = 6/5 + 21/5 × 15/14
= 6/5 + (21×15)/(5×14)
= 6/5 + (3×7×3×5)/(5×2×7)
= 6/5 + (3×3)/2
= 6/5 + 9/2
= 12/10 + 45/10
= 57/10
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(9/15 + 3/10) ÷ 6/5 = (18/30 + 9/30) × 5/6
= 27/30 × 5/6
= (27×5)/(30×6)
= (3×3×3×5)/(3×2×5×3×2)
= 3/(2×2)
= 3/4
12/7 - 4/7 × 35/12 = 12/7 - (4×35)/(7×12)
= 12/7 - (4×7×5)/(7×4×3)
= 12/7 - 5/3
= 36/21 - 35/21
= 1/21
(4/5 + 7/10) ÷ (5/6 - 5/8) = (8/10 + 7/10) ÷ (20/24 - 15/24)
= 15/10 ÷ 5/24
= 15/10 × 24/5
= (15×24)/(10×5)
= (3×5×2×12)/(2×5×5)
= (3×12)/(5)
= 36/5
6/5 + 21/5 ÷ 14/15 = 6/5 + 21/5 × 15/14
= 6/5 + (21×15)/(5×14)
= 6/5 + (3×7×3×5)/(5×2×7)
= 6/5 + (3×3)/2
= 6/5 + 9/2
= 12/10 + 45/10
= 57/10