A few math problems, help me solve them! Please! To be listed! Only if you are right, you will be sc

In Chengbei Primary School, the number of boys who meet the standard: 60*70%=42, and the number of girls who meet the standard: 40*70%=28, therefore, the compliance rate of Chengbei Primary School is: (42+28) 100=90%.

In Chengnan Primary School, the number of boys who meet the standard is: 40 * 50% = 20 people, and the number of girls who meet the standard is: 60 * 50% = 30 people, therefore, the compliance rate of Chengnan Primary School is: (20 + 30) 100 = 50%, so the compliance rate of Chengbei Primary School is high.

The radius of the semicircle is: 12 2=6, the circumference is: (2*, the area of the semicircle is: (square centimeters, so the perimeter of the shadow is: 16 + 12 + 16 + (

The shaded area is: 16* square centimeters.

1.North of the city 60x70%+40x70%=70

Seongnam 40x50%+60x50%=50

The north of the city has a high compliance rate.

2.Shadow area: 232-18 cm2

Circumference: 44+6 cm

Chengbei Primary School: 60* boys 40* 42+28=70 70 100=

Chengnan Elementary School: 40 * boys 60 * 20 + 30 = 50 50 100 =

Chengbei Primary School has a high compliance rate.

Circumference: 16*2+12+1 2*cm.

Area: 16*12-1 2=square centimeters.

Just know how to go online, hurry back and do your homework.

1. Answer: Now the number of boats is x, then.

x-1）*9=(x+1)*6

x=5 There are (5-1) * 9 = 36 students in the class.

square meters = 500 10 (-6) square kilometers 9.6 million = 960 10 4

So it's =(==coal.

1.Let 9-person boat x, 6-person boat x+1, 9x=6(x+1), x=2 So, 2*9=18 (people).

square kilometres = 1,000,000 square metres.

500 square meters = 500 960,0000,000000 square meters to the 21st power kilogram * 500 960,0000,000000 square meters = kilograms of coal.

1. (1) DU250000 5% = 12500 (yuan) zhidao

2) 250000 special 7% = 17500 (yuan) 2, 1000 + 1000 2 yuan).

3. 500 1 yuan).

Yuan) to give points.

1), DU business tax to be paid this month: 250,000*yuan

This month, you have to pay the urban maintenance and construction tax: 12,500* yuan.

2) Withdraw the principal.

DAO and after-tax interest are a total of RMB.

1000*(1+2* = RMB.)

The previous is to calculate the principal + interest, a total of 1054 yuan can be withdrawn. This is followed by the interest after calculating the interest tax of 20% = principal + after-tax interest.

3), Donated the principal and after-tax interest to the disaster area, donated: 517 yuan.

500*(1 + 517 yuan (this question is the same as the second question) or more

So a=3

Then bring 3 into to get 27-3+1=25

3.Cancel with column items, the original formula = 1-(1-1 2+1 2-1 3+......1/99-1/100）

So 2y 2+3y=1, so 2y 2+3y+7=8

Because x=1 so a*1+b=c, so a+b-c=0, so a+b-c-1=-1 so the answer is 1

Because x=1, a+b=c

So a+b-c

Because 0-1=-1

So |-1|=1

And in the remaining 1 12-1 14 + ...1 96-1 98 + 1 100, starting from 1 14, every two numbers are put in parentheses to become 1 12-(1 14-1 16), notice that the number in each parenthesis is greater than 0, so 1 12-1 14+...1 96-1 98+1 100<1 12, in the same way from 1 12 onwards, every two numbers are put in parentheses to become (1 12-1 14)+

1 96-1 98) + 1 100, the number in each parenthesis is greater than 0, so 1 12-1 14 +...1/96-1/98+1/100>0

Therefore 73 120<1-1 2+1 4-1 6+1 8-1 10<83 120

Multiply by 10 and you get 73 12< 1-1 2+1 4-1 6+1 8-1 10<83 12

73 12>6, while 83 12<7, so the integer part is 6

1.The product of the three numbers is (

Solution: Let B's velocity be x km/h, then A's velocity is (3x+1) km/h.

3x＋(3x＋1)×(3－45/60)＝

3x＋(3x＋1)×

3x＋(3＋

x 53x 1 5 3 1 16 (km).

A: A's speed is 16 kilometers per hour and B's speed is 5 kilometers per hour.

The solution of the windless speed is x 2 hours and 50 minutes = 17 6 hours ( x+24) * 17 6 = (x-24) * 3 to obtain x=840 km.

Distance between two cities = (840-24)*3=2448 km.