# F1數學第二部份, 求幫助!!o(_ _)o

**括號內的SE不用管**

**有5題**

**請留言問題後的星星!**

Q6(SE.19.6)

Vivian sold an item at a loss of 30% and she lost \$45.

a) Find the cost of the item

b) Find the selling price of the item

Q7(SE.20.8)

Daniel sells some jackets with a marked price of \$200 each.

7a) Without any discount, it is known that each jacket is sold at a profit of 60%. Find the cost of each jacket.

7b) If Daniel sells the jackets at 40% off, find the percentage profit/loss of selling each jacket.

7c) After offering a discount, the jackets are still sold at a profit of 28%. Find the percentage discount offered.

Q8(SE.44.3)

Mrs. Cheung has bought x barbecue packages A and y barbecue B. There were 6 chicken wings in package A and 4 chicken wings in package B. It is known that Mrs.Cheung bought 34 chicken wings in total. Write an equation in x and y.

Q9(SE.44.4)

There are 6 gears in each large experiment set and 3 gears in each small experiment set. If Gary needs 15 gears, find all possible number of sets in each kind bought.

Q10(SE.48.7)

Steve, Maggie and Cindy buy a birthday gift together, where the amount spent by Steve is 1/3 (三份之一) of that spent by Maggie and 3/4 (四份之三) of that spent by Cindy. Find the radio of the amounts spent by Steve, Maggie and Cindy on the birthday gift.

Q11(SE.48.8)

A painter uses 4 hours to paint the 3m × 12m wall of a building. Express his [ainting speed in m2/h **2 is square**

Q12(SE.48.9)

-It is given that the scale of the floor plan of a flat is 1cm to 0.8m.

On the floor plan, the dimensions of the rectangular bedroom are 3cm × 2.5cm. Find its actual area.

Q13(SE.37.5)

Find the area of quadrilateral ABCD

A=(0,5)

B=(2,2)

C=(-2,-1)

D=(-3,2)

Q14(SE.37.6)

Find the area △ABCD

A=(-1,-1)

B=(5,1)

C=(1,3)

**盡力答吧!!**

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### 2 個解答

• 最愛解答

Q6

a) \$45/30%=\$150

b) \$150-\$45=\$105

Q7

a) \$200/(100%+60%)= \$125

b) \$200*(1-0.4)-\$125=-\$5

c) 1-125*(1+0.28)/200=0.2 20%off

Q8

6x+4y=34

Q9

Let the no. of large experiment set be x and the no. of small experiment set be y.

6x+3y=15

when x=2, y=1.

when x=1, y=3.

When x=0, y=5.

Q10

Let the radio of the amounts spent by Steve, Maggie and Cindy on the birthday gift be a, b and c respectively.

b*1/3=a

c*3/4=a

a+b+c=1

a+a*3+a*4/3=1

a*16/3=1

a=3/16

b=3/16*3=9/16

c=3/16*4/3=1/4

Thus, the radio of the amounts spent by Steve, Maggie and Cindy on the birthday gift is 3/16, 9/16 and 1/4 respectively.

Q11

3*12/4=9m square/h

Q12

Its actual area= (3*0.8)*(2.5*0.8)=4.8msquare

Q13

=the area oftriangle ABD+the area of triangle ACD

=(2-(-2))*(5-2)/2+(2-(-2))*(2-(-2))/2

=4*3/2+4*4/2

=6+8

=14

Q14

Let(3,-1) be W, (5,3) be X, (-1,-1) be Y and (5,-1) be Z.

the area △ABC

=the area squareWXYZ- the area △WCD-the area △CXB-the area △BZY

=(5-(-1))*(3-(-1)-(1-(-1))*(3-(-1))/2-(5-1)*(3-1)/2-(1-(-1))*(5-(-1))/2

=6*4-2*4/2-6*2/2-2*6/2

=24-4-6-6

=8

資料來源： 自己
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