maths~f.1升f.2

1.甲乙兩地相距30km,A車以時速70km/h從甲地駛往乙地,B車則從乙地駛往甲地.若兩車同時出發,並於15分鐘後相遇,求B車的速率(答案以km/h表示)

2. 6分之2x+1 - 6分之x-3=x

3.Mary is 2y years old now. Fire years ago, her age was half of her father's age. Express the present age of her father in terms of y(in expanded form).

4.If each side of a squre is decreased by 12cm, the new perimeter will be 124cm.Find the original length of each side and the original perimeter of the square.

5.Sam pays $145 for 2 T-shirts and 4 pairs of socks. If the price of each pair of sock is1/5 of each T-shirt, find the price of a T-shirt.

6. Some sweet are shared by a group of children. If each child gets 5 sweets, 8 sweets will be left. If each child wants to get 7 sweets, 10 more sweets will be needed. How many sweets are there?

1. 15分鐘=0.25h
(30-70乘0.25)除0.25
=(30-17.5)除0.25
=12.5除0.25
=50(km/h)

第二題係邊GA..
3-6未做- -..