Question

计算(-2/1)^-1+3^2÷2012^0-|根号下2-7|,第二:34.5^2+69+65.5+65.5^2,第三:

Answer 1

(-2/1)^-1+3^2÷2012^0-|根号下2-7|,

=-2+9÷1-7+√2

=√2

34.5²+69×65.5+65.5²

=34.5²+2×34.5×65.5+65.5²

=（34.5+65.5）²

=100²

=10000 这个题目我改过.

x-1/x+1-x/2=2

（x-1)/x-(x-1)/2=2

(x-1)/(x-2)=2

x-1=2x-4

x-2x=1-4

-x=-3

∴x=3