1,400÷【(1+12%)的10次方】+800÷【(1+12%)的9次方】+………………4000
2,设为x
x+x(1+10%)+x(1+10%)²……+x*【(1+10%)九次方】=100
求x=100÷【1+(1+10%)+(1+10%)²……【(1+10%)九次方】】
要算出结果难得一毛,得用计算器.
1,400÷【(1+12%)的10次方】+800÷【(1+12%)的9次方】+………………4000
2,设为x
x+x(1+10%)+x(1+10%)²……+x*【(1+10%)九次方】=100
求x=100÷【1+(1+10%)+(1+10%)²……【(1+10%)九次方】】
要算出结果难得一毛,得用计算器.