1、( 1)80,20, 125,25。
(2)26.5
(3) 16
2、( 1)20÷25=80%
(2)(25—20)÷20=25%
3、(3—2.4)÷2.4=25%
4、24÷(24+48)≈33.3%
5、( 1/5— 1/8) ÷ 1/5=37.5%
page 2
1、(20— 16)÷ 16=25%
2、(30— 15)÷30=50%
3、(2762—2 1 10)÷2 1 10≈30.9%
4、(2800—2700)÷2800≈3.6%
5、 12 1÷( 12 1—66)=220%
Page 3
1、( 120—80)÷80=50%
2、( 1)(20— 16)÷20=20%
(2)(20— 16)÷ 16=25%
3, 23+25=48 (person) (48-42) ÷ 42 ≈ 14.3%
4、( 1)(52+75+28)÷ 160≈96.9% (36+69+80)÷200=92.5%
(2) Omission
Page 4
1, (1) 1 m; 0.96 kg
(2)4.32,3
(3)8.4,0.75
2.860×5%=43 (ten thousand yuan)
3. 1800×20%=360 (ten thousand yuan)
4.7500× 10%+7500=8250 (yuan)
5. (1800—1600) × 5% =10 (yuan)
Page 5
1, (1)6000×5.40%×3=972 (yuan)
(2)972—972×5%=923.4 yuan.
2.2000×5.40%×3=324 yuan; 324—324×5%=307.8 yuan.
3. 4000× (4.68%-3.06%) 2 =129.6 (yuan)
4.5000× 40 %× 4.14 %× (1-5%) = 78.66 yuan.
Page 6
1、( 1)×(2)√(3)√(4)×
2、70,95,55,65。
3, 306 ÷ 360 = 85% ... 15% discount.
4, 2800-2800× 85% = 420 (yuan)
5. Children's bookstores are cheaper.
Page 7
1, 360×80%=288 (yuan) 440×75%=330 (yuan) 2 100×88%= 1848 (yuan)
2.( 1)5×65%=3.25 (yuan) 3.8×65%=2.47 (yuan) 6×65%=3.9 (yuan)
(2) 10÷3.25≈3 (package) 10÷3.9≈2 (package) 10÷2.47≈4 (package)
There are many ways to buy, including buying one cake, two cakes and three cakes, which are omitted here.
3.5800×80%×90%=4 176 (yuan)
Page 8
1, 1500×80%= 1200 (yuan) 900×80%=720 (yuan) 580×80%=464 (yuan)
2, 4850-4850× 90% = 485 (yuan)
3.( 1)45×96%=43.2 (ten thousand yuan) = 432,000 (yuan)
(2) 432000+432000×1.5% = 438480 (yuan)
4. Lost.
Page 9
1 、( 1)85%x, 1.85x
(2)75%x, 0.25 times
2、30,20
3、X+70%X=5 10
X=300
70%X=2 10
A: There are 30 white rabbits and 2 black rabbits10.
4, 24 ÷ (1-20%) = 30 (only) 30×20%=6 (only) Answer: 30 white rabbits and 6 black rabbits.
5. 126( 1+80%)= 70 (kWh) 80%×70=56 (kWh)
Page 10
1、2,2。
2.( 1) 1 monthly tonnage of coal-February ratio 1 monthly tonnage saved = tonnage of coal used in February.
X-20% X = 1.6
X=2
(2) The speed of the car+the speed of the train faster than the car = the speed of the train.
X+35%X= 108
X=80
3.( 1) solution: let the floret weigh x kilograms.
X+20%X=30
X=25
(2)30+30×20%=36 (kg)
Page 1 1
1, solution: Suppose that X million TV sets were produced in the second half of last year.
x- 1/5X = 48
X=60
2. Solution: Let Xiaoli save X yuan.
X+ 1/ 10X=88
X=80
3. Solution: Let light travel at the speed of x million kilometers per second.
1/5X—2=4
X=30
4. Solution: Suppose there are X girls and 4/5X boys.
X+4/5X=540
X=300
4/5=240
Page 12
1, (1)60×4/5=48 (tree) (2) solution: there are x pear trees. 5/4x = 60x = 48 (3) 60-60x1/5 = 48 (tree) (4) Solution: there are x pear trees. X+ 1/4X=60X=482。 Solution: Suppose there are X cocks and 3/8X hens. X—3/8X=40X=643/8X=243。 Solution: Suppose there are X male employees and 2/5X female employees. X+2/5X=840X=6002/5X=240
Page 13
1、( 1)62.5, 160,37.5,60。
(2)240,48,80。
2、( 1)44÷(32+ 12+44)=50%
(2)(44— 12)÷ 12≈26.67%
3、(4800—2500)÷2500=92%
4、(240— 180)÷240=25%
180 ÷ 240 = 0.75 ... 25% off.
Page 14
1, (1)150—150× 40% = 90 (tree)
(2)150+150× 40% = 210 (tree)
2800×3.06% 2 = 48.96 (yuan)
48.96—48.96≈46.5 1 (yuan)
800+46.5 1=846.5 1 (yuan)
3.12.8× 90% =1.52 (ten thousand yuan) = 1 15200 (yuan)
4.(4000-800) × 14% = 448 (yuan) 4000-448 = 3552 (yuan)
Page 15
1. solution: 92% x = 1.38.
x= 1.38÷92%
x= 1.5
Solution: x+ 1.2x=7.7.
2.2x=7.7
x=3.5
2.( 1) Solution: Let this elevated highway be x meters long.
x-85%x=4.5
15%x=4.5
x=30
(2) 25.5/85% = 30 km
30× (1-85%) = 4.5km.
3. Solution: Suppose the original price of this commodity is X yuan.
x- 15%x=340
85%x=340
x=400
(1) is 20% more than volleyball x+x× 20% = 60.
(2) 20% less than volleyball x-x× 20% = 60.
(3) Volleyball is 20% 60+60× 20% more than football.
(4) The number of volleyball is 20% less than that of football, 60-60× 20%.
Hope to adopt! ! !