七年级上册数学练习册答案（七年级上册数学练习册答案）

七年级上册数学练习册答案

第一章：整数

小标题：加法与减法

1. 填空题：
a) -8 + 5 = -3
b) -12 - (-4) = -8
c) 3 - (-7) = 10
d) -9 + (-2) = -11
e) -6 - 9 = -15

2. 计算题：
a) 6 + (-8) = -2
b) -11 + 7 = -4
c) -5 + (-6) = -11
d) 3 + (-9) = -6
e) -13 + (-2) = -15

小标题：乘法与除法

1. 填空题：
a) -7 × 3 = -21
b) -8 ÷ (-2) = 4
c) 20 ÷ (-4) = -5
d) 9 × (-5) = -45
e) -12 ÷ 6 = -2

2. 计算题：
a) -4 × 5 = -20
b) -12 ÷ (-3) = 4
c) 24 ÷ (-6) = -4
d) 7 × (-8) = -56
e) -16 ÷ 4 = -4

第二章：有理数

小标题：有理数的大小比较

1. 判断题：
a) -5 < -4
b) -2 > -3
c) -3 > -5
d) 0 < 1
e) -6 > -8

2. 填空题：
a) -7 < -6
b) -9 > -10
c) -2 > -4
d) 0 < 3
e) -5 > -7

小标题：加法与减法

1. 填空题：
a) -5 + (-3) = -8
b) -9 - (-4) = -5
c) 2 - (-6) = 8
d) -7 + 2 = -5
e) -3 - 5 = -8

2. 计算题：
a) 3 + (-9) = -6
b) -8 + 5 = -3
c) -5 + (-6) = -11
d) 1 + (-7) = -6
e) -4 + (-2) = -6

第三章：代数式与方程式

小标题：代数式的计算

1. 填空题：
a) 3x - 4y, x = 2, y = 3
= 3(2) - 4(3)
= -6
b) 2x - 5, x = -3
= 2(-3) - 5
= -11
c) x^2 + 4y, x = 1, y = 2
= (1)^2 + 4(2)
= 9
d) 4 - x^2, x = -2
= 4 - (-2)^2
= 0
e) -x^2 + 3y, x = -1, y = -2
= -(-1)^2 + 3(-2)
= -1 + (-6)
= -7

2. 计算题：
a) 2x - 3y, x = -2, y = 4
= 2(-2) - 3(4)
= -4 - 12
= -16
b) 3x - 2, x = 5
= 3(5) - 2
= 13
c) -2x^2 + 3y, x = 1, y = -1
= -2(1)^2 + 3(-1)
= -2 - 3
= -5
d) 4 - x^2, x = 3
= 4 - (3)^2
= 4 - 9
= -5
e) x^2 - 5y, x = -4, y = 2
= (-4)^2 - 5(2)
= 16 - 10
= 6

标签。文章总字数为2000-2500字左右。