化简求值 (1g2)^3+(1g5)^3+3*1g2*1g5
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化简求值 (1g2)^3+(1g5)^3+3*1g2*1g5
化简求值 (1g2)^3+(1g5)^3+3*1g2*1g5
化简求值 (1g2)^3+(1g5)^3+3*1g2*1g5
(1g2)^3+(1g5)^3+3*1g2*1g5
=(lg2+lg5)[(lg2)²-lg2lg5+(lg5)²]+3lg2lg5
=lg10[(lg2)²-lg2lg5+(lg5)²]+3lg2lg5
=(lg2)²-lg2lg5+(lg5)²+3lg2lg5
=(lg2)²+2lg2lg5+(lg5)²
=(lg2+lg5)²
=(lg10)²
=1²
=1
那个15级是对的
(1g2)^3+(1g5)^3+31g2*1g5
=(lg2+lg5)[(lg2)^2+(lg5)^2-lg2lg5]+31g2*1g5
=[(lg2)^2+(lg5)^2-lg2lg5]+31g2*1g5
=[(lg2)^2+(lg5)^2+2lg2lg5]
=(lg2+lg5)^2
=1
前面回答的都正确
化简求值 (1g2)^3+(1g5)^3+3*1g2*1g5
(1g2)^3+(1g5)^3+31g2*1g5=?
解(1g2)^3+(1g5)^3+1g5*1g8
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(1g5)+21g2-(1g2)
1g2+1g5=
1g2+1g5等于
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