345+102+1980-920-165-1989

解答

345 + 102 + 1980 - 920 - 165 - 1989

- 647

求解步骤

345 + 102 + 1980 - 920 - 165 - 1989

遵循 PEMDAS 运算顺序

加减（左右）

345 + 102 = 447

= 447 + 1980 - 920 - 165 - 1989

447 + 1980 = 2427

= 2427 - 920 - 165 - 1989

2427 - 920 = 1507

= 1507 - 165 - 1989

1507 - 165 = 1342

= 1342 - 1989

1342 - 1989 = - 647

= - 647

7 \times 7 - (8 - 2)

(3 - 5) \times 5

\frac{3 8 ^{2}}{4 ( 8 ) ^{3}}

(3 - 5) + 4 (3 - 1) - 3 (1 + 1) (2) + 2 (3) 2

\frac{3}{3 ^{2} + 9}