Решите 3 задание Заранее спасибо!
2/3 × m = 4/7 × 4,2 m = 4/7 × 21/5 ÷ 2/3 = 4/7 × 21/5 × 3/2 = (2×3×3)/(1×5×1) = 18/5 m = 3 3/5 m = 3,6 проверим: 2/3 × 3,6 = 4/7 × 4,2 2/3 × 18/5 = 4/7 × 21/5 (2×6)/(1×5) = (4×3)/(1×5) 12/5 = 12/5 2,4=2,4
4/7×4.2=4/7×4 2/10=4/7×4 1/5=4/7×21/5=12/5 2/3м=12/5 м=12/5÷2/3=12/5×3/2=36/10=3.6 м=3.6