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
m³
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
黄
白
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)
Generated by CamScanner from intsig.com
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