Tính: -7/2--25/9÷10/27×-3/5×7/9+(-3/5)×2/9+3/5 Tham khảo câu trả lời từ Trợ lý ảo Lazi To simplify the given expression, let's follow the order of operations (PEMDAS). First, let's simplify the division: -7/2 - (-25/9 ÷ 10/27) × -3/5 × 7/9 + (-3/5) × 2/9 + 3/5 -7/2 - (-25/9 × 27/10) × -3/5 × 7/9 + (-3/5) × 2/9 + 3/5 -7/2 - (-675/90) × -3/5 × 7/9 + (-3/5) × 2/9 + 3/5 -7/2 - (-675/90) × -21/45 + (-3/5) × 2/9 + 3/5 -7/2 - (675/90) × 21/45 + (-3/5) × 2/9 + 3/5 -7/2 - (675/90) × 7/15 + (-3/5) × 2/9 + 3/5 -7/2 - 4725/1350 + (-3/5) × 2/9 + 3/5 Next, let's simplify the multiplication: -7/2 - 4725/1350 + (-3/5 × 2/9) + 3/5 -7/2 - 4725/1350 + (-6/45) + 3/5 -7/2 - 4725/1350 - 6/45 + 3/5 -7/2 - 35/10 - 6/45 + 3/5 Now, let's find a common denominator for the fractions: -7/2 - 35/10 - 6/45 + 3/5 -7/2 - 175/50 - 6/45 + 27/45 Next, let's convert all the fractions to have the same denominator: -7/2 - 175/50 - 6/45 + 27/45 -7/2 - 350/100 - 4/30 + 54/90 Now, let's simplify the fractions: -7/2 - 350/100 - 4/30 + 54/90 -7/2 - 7/2 - 2/15 + 6/10 Next, let's find a common denominator for the fractions: -7/2 - 7/2 - 2/15 + 6/10 -70/20 - 70/20 - 8/60 + 36/60 Now, let's combine the fractions: -70/20 - 70/20 - 8/60 + 36/60 (-70 - 70 - 8 + 36)/60 -112/60 Finally, let's simplify the fraction: -112/60 = -56/30 = -28/15 Therefore, the simplified expression is -28/15.