a)90 is increased by 5% and then increased by 6%
90X(1+5%)X(1+6%)
=90X1.05X1.06
=100.17
b)10mm is decreased by 40% and then increased 20%
10X(1-40%)X(1+20%)
=10X0.6X1.2
=7.2mm
c)$300 is decreased by 40% and then increased 20%
300X(1-40%)X(1+20%)
=300X0.6X1.2
=$216
d) minutes is increaed (300/7)% and then decreased by 30 %
1X(1+300/7%)X(1-30%)
=1X(100%+300/7%)X0.7
=1X(142 6/7%)X0.7
=0.7X(1000/7%)
=(0.7 X 1000 / 7)%
=100%
=1minute ←這一題跟本是玩人的說
e)100kg is decreased by 35% and then decreased by 10%
100X(1-35%)X(1-10%)
=100X0.65X0.9
=58.5kg
f)65km is increased by 15% and then increased (1-90%)
65X(1+15%)X(100%+1-90%)
=65X1.15X1.1
=82.225km
d)320hours is decreased by 32% and then increased by 32%
320X(1-32%)X(1+32%)
=320X0.68X1.32
=287.232hours
給我300icashXDDD[ 此帖被瑋哥在2008-05-10 20:58重新編輯 ]