Question

（x-二分之一y-1）（x-二分之一y+1）-（x-二分之一y-1）的平方,其中x=1.7,y=3.9 过程给出来,

Answer 1

√18除以√8

=√(18÷8)

=√(9/4)

=3/2

√0.4乘以√3.6

=√(0.4×3.6)

=√1.44

=√1.2²

=1.2

√3分之2乘以√8分之27=

=√(2/3×8/27)

=√(16/81)

=4/9

√2除以3√40

=(1/3)√(2÷40)

=(1/3)√(1/20)

=(1/3)√(5/100)

=(1/3)(√5)/10

=(√5)/30