1.(x+y)²-4xy=(x-2)²
2.x²-(10xy )+25y²=(x-5y )²
3.x²-8x²y²+16y四次方=(x-4y² )²
4.7.2²-2.8²= (7.2+2.8)*(7.2-2.8)=10*4.4=44 .
1.(x+y)²-4xy=( )²
1.(x+y)²-4xy=( )²
2.x²-( )+25y²=( )²
3.x²-8x²y²+16y四次方=( )²
4.7.2²-2.8²= .
2.x²-( )+25y²=( )²
3.x²-8x²y²+16y四次方=( )²
4.7.2²-2.8²= .
数学人气:622 ℃时间:2020-04-12 10:25:36
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