Question

【做好给10分】百分数应用题1.圆的面积是15.7平方厘米,求圆内正方形的面积.直接用r的平方解题.2.A,B两人共同加

Answer 1

1.

r^2=15.7/3.14=5

5*5/2/2

=25/2/2

=25/4(平方厘米)

2.

280/(1-1/5-1/3)

=280/(1-3/15-5/15)

=280*15/7

=600(个)

3.

450/4.5*3/(3+2)

=100*3/5

=60(km)

4.

3.2*(1+25%)*12/3.2

=12*125%

=15(天)

5.

3000/(5000-3000)

=3000/2000

=150%