If a and b are non-zero real numbers and (1-99a)(1+99b)=b,then the value for 1／a-1／b+1 is( )

题目

If a and b are non-zero real numbers and (1-99a)(1+99b)=b,then the value for 1／a-1／b+1 is( )
(a)1 (b)100 (c)-1 (d)-100

答案

consecutive odd numbers 连续的奇数 value(mathematics 数) number or quantity represented by a letter 值; 数值 b的三次方=1331 b就是11 a是9,c是