因式分解 1+10t+25t² 这个我看答案还是看不懂 求讲解
2个回答
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完全平方公式
a" + 2ab + b" = ( a + b )"
这个 1 + 10t + 25t" ,
a 是 1 ,
b 是 5t ,
对应的
a" + 2ab + b"
= 1" + 2X( 1 )X( 5t ) + ( 5t )"
= 1 + 10t + 25t"
= ( 1 + 5t )"
又因为加法相加律,
a" + 2ab + b" = b" + 2ab + a"
= ( a + b )" = ( b + a )"
所以
1 + 10t + 25t"
= ( 1 + 5t )"
= ( 5t + 1 )"
或者
1 + 10t + 25t"
= 25t" + 10t + 1
= ( 5t )" + 2X( 5t )X( 1 ) + 1"
= ( 5t + 1 )"
a" + 2ab + b" = ( a + b )"
这个 1 + 10t + 25t" ,
a 是 1 ,
b 是 5t ,
对应的
a" + 2ab + b"
= 1" + 2X( 1 )X( 5t ) + ( 5t )"
= 1 + 10t + 25t"
= ( 1 + 5t )"
又因为加法相加律,
a" + 2ab + b" = b" + 2ab + a"
= ( a + b )" = ( b + a )"
所以
1 + 10t + 25t"
= ( 1 + 5t )"
= ( 5t + 1 )"
或者
1 + 10t + 25t"
= 25t" + 10t + 1
= ( 5t )" + 2X( 5t )X( 1 ) + 1"
= ( 5t + 1 )"
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