2(lg√2)^2 +lg√2*lg5+(√(lg√2)^2-lg2+1)
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2(lg√2)^2 +lg√2*lg5+(√(lg√2)^2-lg2+1)
(lg√2)^2-lg2+1
都是要开根号的·~
(lg√2)^2-lg2+1
都是要开根号的·~
lg√2=(1/2)lg2
lg5=1-lg2
所以原式=2*(1/4)(lg2)^2+(1/2)lg2(1-lg2)+√[(1/4)*(lg2)^2-lg2+1]
=(1/2)(lg2)^2+(1/2)lg2-(1/2)(lg2)^2+(1/2))*√[(lg2)^2-4lg2+4]
=(1/2)lg2+(1/2)√(1-lg2)^2
=(1/2)lg2+(1/2)*(1-lg2)
=(1/2)lg2+(1/2)-(1/2)lg2
=1/2
lg5=1-lg2
所以原式=2*(1/4)(lg2)^2+(1/2)lg2(1-lg2)+√[(1/4)*(lg2)^2-lg2+1]
=(1/2)(lg2)^2+(1/2)lg2-(1/2)(lg2)^2+(1/2))*√[(lg2)^2-4lg2+4]
=(1/2)lg2+(1/2)√(1-lg2)^2
=(1/2)lg2+(1/2)*(1-lg2)
=(1/2)lg2+(1/2)-(1/2)lg2
=1/2
2(lg√2)^2 +lg√2*lg5+(√(lg√2)^2-lg2+1)
2(lg√2)^2+lg√2*lg5+√(lg)√2^2-lg2+1
2(lg√2)^2 + lg√2 * lg5 + √(lg√2)^2-lg2+1 怎么计算?
计算 2(lg√2)^2+lg√2 * lg5+√[(lg√2)^2-lg2+1]
2(lg√2)² + lg√2 * lg5 + √(lg√2)² - lg2 + 1 怎么算
(lg²2-lg2*lg5+lg²)+3lg2*lg5
lg(√2)^2+1/2lg2*lg5+√((lg√2)^2-lg2+1)
(lg√2)^2+1/2lg2*lg5+√(lg√2)^-lg2+1 化简求值
(lg√2)^2+1/2lg2*lg5+√(lg√2)^-lg2+1 化简求值
lg^2 5+lg2*lg5+lg2=?
计算:|lg2-lg^2(5)|+lg2·lg50+√(lg5-1)^2
2(lg√2)²+lg√2Xlg5+√(lg√2)²-lg2+1