作业帮七年级人教版下

2024-08-26

作业帮七年级人教版下

作业帮七年级人教版下 篇1

15.6

6.3 18/7

0.5 8/5 1 35/18 1

40306500 1/12

0.5 96

=25+27-48 =4

=7/3+2/3

=3

=0

=1/4

Generated by CamScanner from intsig.com 18+18×1/2=27(元)

(18×8+18÷2×2)÷10=16.2(元)

(18×2+18÷2×8)÷10=10.8(元)

1649+1649-989 = 2309(米)答:

(30+17)÷69×100% ≈68.1% 答:

56×(1-1/8)=49(人)答:

Generated by CamScanner from intsig.com 解:x=2.4

解:3x=1.5

x=0.5

解:5/12x=5/6 x=2

=330

=14.7

=18

= 3/8×60

=10

=45/2

(15×10+15×24+10×24)×2

= 1500(平方厘米)

答:

Generated by CamScanner from intsig.com 2.45×30=73.5(元)答:

8×5×1

=40(立方分米)

答:

0 1 12

123

1234

12345

123456

Generated by CamScanner from intsig.com 40

7/15

5.87 45 1/8

1/6

1.9

14/15

解: x=25

解: x=

6/5 解: x=5.2

解:x=3/4

18×4×6

= 432(立方分米)

5×3×14

=210(立方厘米)

A

C

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C

C

15×0.9+(21-15)×3

=31.5(元)

8000×(1-3/5)=3200(辆)答:

9÷(1-1/4-15%)=15(千米)

答:

78×2×5/12 =65

78×2×7/12 = 81 答:

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×

√ 0.6

0.125 1.3 1

11/7 4.4

0.84 2.95

(1-0.3)×0.4+2.2

=2.48

解:设这个数是x,5x+2.4=16×0.4 x= 0.8

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(5+10)×5÷2

=37.5(平方厘米)

20×10+5×8÷2 =220(平方厘米)

1-1/4-2/5 =7/20 答:

20×2÷4-3-3 =4(米)

答:

840÷(65+75)

=6(分钟)

8:00+0:06=8:06 65×6=390(米)

第:

Generated by CamScanner from intsig.com 3×2.2×2

=13.2(m³)

答:

60×30×30÷(15×3×3)

=400(盒)答:

2×1.5×0.2 =0.6

(dm³)答:

16×12.5×10 =2000(㎏)答:

Generated by CamScanner from intsig.com 6×4÷2 =12(c㎡)

5×5÷2

=12.5(c㎡)

面积变大

4×6÷2 =12(c㎡)

面积不变

高增加和底减小的数值越大,面积越小。

高加3cm,底减小3cm,面积为10.5 c㎡

6×4.5÷(0.4×0.4)=168.75

≈169(块)

设儿子为x,则妻子为x/2,女儿为 x/4.x+x/2+x/4=1

x=4/7

妻子2/7,女儿1/7

数学家的意思是妻子能继承的财产只能是儿子的一半,而女儿能继承的财产只能是妻子的一半

Generated by CamScanner from intsig.com 5/3 6

0.65 5 15 1/5

125

1/7-1/8

1/7×1/8

7/8-7/15-

7/8×7/15

1/99-1/100 1/99×1/100

C

D S=(8×4+8×7+4×7)×2 =232(c㎡)V=8×7×4=224(cm³)

(50-45)÷45×100%

≈11.11% 答:

(500-4)÷500×100%

=99.2% 答:

150×(1-15%)

=127.5(元)答:

(1/2+1/3)÷1/6=5(1/2-1/3)÷1/6=1 12.56 18.84

28.26 2/3

7/12

21.98 2/5 314

52 90

×

× √

×

Generated by CamScanner from intsig.com

Generated by CamScanner from intsig.com =(3/4-3/10)÷6/25

=19/6

=15/8

=1/2

=1

=157/21

=2/25

解:设有大船x只,则小船有10-x只

6x+4×(10-x)=44

x=2

10-2=8(只)答:

解:设5元有x张,则2元有18-x张 5x+2×(18-x)=60 x=8 18-8=10

答: 0.5

450 25

1900

Generated by CamScanner from intsig.com(20+16+12)×4÷12 =16(cm)答:

12.2

3×2÷2 =3(c㎡)

4×5=20(c㎡)

(9+5.8)×4÷2

=29.6(c㎡)

1/3 2/3

1/4 3/4

Generated by CamScanner from intsig.com 9 1.6

0.9 2/21

C

5/21 9/2 3.6

B

B

=0

=3/2

=13/6

=0

解:x=1/5

解:x=49/51

解:X=14/55

Generated by CamScanner from intsig.com(510-30)÷3=160(棵)160×2+30=350(棵)

答:

12÷3.2=3.75(㎏)

12÷(3.2×1.5)=2.5(㎏)

12÷(3.2+4.8)=1.5(㎏)

Generated by CamScanner from intsig.com

3/8 0.375 37.5%

3/8 0.375 37.5%

=4.6

=52+28-44 =36

=17/12

=24

×

× ×

Generated by CamScanner from intsig.com

10×6+10×12÷2

(4+3+4+8)×10÷2-3×3 =86(c㎡)

=120(c㎡)

1/3

2/3

3/3 5/3

4/3 16

Generated by CamScanner from intsig.com 5.75 0.64

0.1 2

21.6 9 3.8

8.14-6.35=1.79

4/15÷5/12=16/25

5/12×9-15/16÷5 =15/4-3/16

=57/16

cm³ mL L

dm³mL

Generated by CamScanner from intsig.com 30÷(30+30+20)=3/8

答:

38×4=152(元)

152×80%=121.6(元)

Generated by CamScanner from intsig.com

× × √ ×

3/5 7/5

14/5

24/5

1-3--

解:x=5/6

解:x=2.28

解:x=6/7

解:x=10

(132+144+144+136+132+138+144+139)÷8= 138.625

中位数:138,144 众数:144

Generated by CamScanner from intsig.com 解:设从乙袋中取x千克倒入甲袋,2×(34.5-x)=67.5+x

x=0.5

答: 解:设有羊x头,则牛有2/5x+28头 x+2/5x+28=980

x=680 680×2/5+28=300

答:

Generated by CamScanner from intsig.com =6410

= 18450 =0.625

= 1.28

=17/24

=3/4

71×0.5×(1+1/10)= 39.05(升)

Generated by CamScanner from intsig.com(2700-2500)÷2500×100%

= 8%

答:

Generated by CamScanner from intsig.com 7.97 1 21

5/8 1 75

1/5

150

2/3

偶数

1/6

Generated by CamScanner from intsig.com

3÷1/4 =12(小时)12-3=8(小时)

正方体

6×6×6 =216(cm³)

长方体

8×3×5

=120(cm³)

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