3-10+9× 7

解答

3 - 10 + 9 \cdot 7

56

求解步骤

3 - 10 + 9 \cdot 7

遵循 PEMDAS 运算顺序

乘除（左右）

9 \cdot 7 : 63

9 \cdot 7

9 \cdot 7 = 63

= 63

= 3 - 10 + 63

加减（左右）

3 - 10 + 63 : 56

3 - 10 + 63

3 - 10 = - 7

= - 7 + 63

- 7 + 63 = 56

= 56

= 56

2 \cdot (3 + 1) + 2

\frac{- 2 - ( - 6 ) ( + 1 )}{( - 2 + 4 ) ( - 1 )}

72 - 36 \div 12 - 6

2 + 2 \times 3^{2} - 4

18 - (7 + 3 - 15 - 4) - 15