数学化简体

来源:百度知道 编辑:UC知道 时间:2024/07/07 20:55:43
(1):(1-a)*4倍根号下『1/(a-1)^3}
(2);2(lg根号2)^2+lg根号2*lg5+根号下{(lg根号下2)^2-lg2+1}
(3):(lg5)^2+lg2*lg50

答案1
:(1-a)*4倍根号下『1/(a-1)^3}
=(1-a)*4根号(a-1)/(a-1)^2
=4*根号(a-1)/(1-a);

2)
2(lg根号2)^2+lg根号2*lg5+根号下{(lg根号下2)^2-lg2+1}
=2*lg根号2*lg根号2+lg根号2*lg5+根号下{(lg根号下2)^2-lg2+1}
=lg根号2+根号下{(lg根号下2)^2-2(lg根号2)^2+lg根号2*lg5+lg2+lg5}
=lg根号2+根号下{lg根号2*(1-lg根号2)+lg5*(1-lg根号2)}
=lg根号2+lg5*根号2
=lg2+lg5
=1

3)(lg5)^2+lg2*lg50
=(lg5)^2+lg2*(lg5+lg10)
=(lg5)^2+lg2*(lg5+1)
=lg5*lg5+lg2*lg5+lg2;
=lg5+lg2
=1;