作业帮( 1g5 )^2+21g2-( 1g2)^2计算此题.
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( 1g5 )^2+21g2-( 1g2)^2计算此题.
( 1g5 )^2+21g2-( 1g2)^2
计算此题.
( 1g5 )^2+21g2-( 1g2)^2计算此题.
( 1g5 )^2+21g2-( 1g2)^2
==(1g5)^2-(1g2)^2+2lg2
=(lg5+lg2)(lg5-lg2)+2lg2
=lg5-lg2+2lg2
=lg5+lg2
=1
(1g5)+21g2-(1g2)
lg5+lg2*1g5+(1g2)^2
(1g5)的2平方+21g2-(1g2)的2平方
( 1g5 )^2+21g2-( 1g2)^2计算此题.
1g2+1g5=
1g2+1g5等于
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