1.(lg5)2次方+lg2*lg50

问题描述:

1.(lg5)2次方+lg2*lg50

1.(lg5)2次方+lg2*lg50(lg5)²+lg2*lg50=(lg5)²+lg2x(lg5*5*2)=(lg5)²+lg2x(lg5+lg5+lg2)=(lg5)²+2lg2lg5+(lg2)²=(lg5+lg2)²=(lg10)²=1²=1