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! ! !