5题数学题,能做几题做几题!!答得好,加分!

来源:百度知道 编辑:UC知道 时间:2024/05/17 05:47:04
(1)一个人在看一本书,他从a页看起,一直看到b页(a小于b),他看了几页? ?

(2)写出一个能表达式子 -60+15-32 实际意义的例子 ?

(3)(x-7)+(y+1)的2次方=0 ,那么 y的x次方= ?

(4)有4个数 2,3,7,9, 只能用加,减,乘,除 四则运算使其结果等于24,写三个算式 ?

(5)在一个正方形中(3行3列)分别填入 -2,-1,0,1,2,3,4,5,6, 使得每一行每一列的三个数,斜对角的三个数值和都相等。 ?
说清楚是哪题。

b-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)