Question

初三2道计算题1.(15根号1/48 - 6根号27）/2根号32.根号2*X^2-（根号2 + 2）=0

Answer 1

1.(15*(1/48)^0.5-6*(27)^0.5)/(2*3^0.5)

=(15*(1/3^0.5)/4-6*3*3^0.5)/(2*3^0.5)

=(3^0.5)*(15*/3/4-18)/(2*3^0.5)

=(5/4-18)/2

=(5-32)/4/2

=-27/8

2.2^0.5*X^2-(2^0.5+2)=0

2^0.5*X^2=(2^0.5+2)

X^2=(2^0.5+2)/2^0.5

=1+2^0.5

X1=(1+2^0.5)^0.5

X2=-(1+2^0.5)^0.5