5题数学题,能做几题做几题!答得好,加分!
10个回答

-a+1

x-7=0

x=7

y+1=0

y=-1

(-1)^7=-1

1:2 × (3 × 7 - 9)

2:2 × ((3 × 7) - 9)

3:2 × (7 × 3 - 9)

4:2 × ((7 × 3) - 9)

5:3 ÷ 2 ×(7 + 9)

6:(3 ÷ 2) × (7 + 9)

7:3 ÷ (2 ÷ (7 + 9))

8:3 ÷ 2 ×(9 + 7)

9:(3 ÷ 2) × (9 + 7)

10:3 ÷ (2 ÷ (9 + 7))

11:(3 × (7 - 2)) + 9

12:3 × (7 - 2) + 9

13:(3 × (7 + 9)) ÷ 2

14:3 × (7 + 9) ÷ 2

15:3 × ((7 + 9) ÷ 2)

16:(3 × 7 - 9) × 2

17:((3 × 7) - 9) × 2

18:(3 × (9 + 7)) ÷ 2

19:3 × (9 + 7) ÷ 2

20:3 × ((9 + 7) ÷ 2)

21:(7 - 2) × 3 + 9

22:((7 - 2) × 3) + 9

23:(7 × 3 - 9) × 2

24:((7 × 3) - 9) × 2

25:(7 + 9) ÷ 2 × 3

26:((7 + 9) ÷ 2) × 3

27:(7 + 9) ÷ (2 ÷ 3)

28:(7 + 9) × 3 ÷ 2

29:((7 + 9) × 3) ÷ 2

30:(7 + 9) × (3 ÷ 2)

31:9 - (2 - 7) × 3

32:9 - ((2 - 7) × 3)

33:9 - (3 × (2 - 7))

34:9 - 3 ×(2 - 7)

35:9 + (3 × (7 - 2))

36:9 + 3 ×(7 - 2)

37:9 + (7 - 2) × 3

38:9 + ((7 - 2) × 3)

39:(9 + 7) ÷ 2 × 3

40:((9 + 7) ÷ 2) × 3

41:(9 + 7) ÷ (2 ÷ 3)

42:(9 + 7) × 3 ÷ 2

43:((9 + 7) × 3) ÷ 2

3 4 -1

-2 2 6

5 0 1