4a^2=( )^2 16/25X^4Y^2=( )^2 36(X+2Y)^2=[ ]^2 49(X-3Y)^2=[ ]^2 因式分解,

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4a^2=( )^2 16/25X^4Y^2=( )^2 36(X+2Y)^2=[ ]^2 49(X-3Y)^2=[ ]^2 因式分解,

4a^2=( )^2 16/25X^4Y^2=( )^2 36(X+2Y)^2=[ ]^2 49(X-3Y)^2=[ ]^2 因式分解,
4a^2=( )^2 16/25X^4Y^2=( )^2 36(X+2Y)^2=[ ]^2 49(X-3Y)^2=[ ]^2 因式分解,

4a^2=( )^2 16/25X^4Y^2=( )^2 36(X+2Y)^2=[ ]^2 49(X-3Y)^2=[ ]^2 因式分解,
4a^2=( 2a)^2
16/25X^4Y^2=(4/5x^2y )^2
36(X+2Y)^2=[6x+12y ]^2
49(X-3Y)^2=[7x=21y ]^2

4a^2=(2a )^2
16/25X^4Y^2=(4/5x^2y)^2
36(X+2Y)^2=[6(x+2y) ]^2
49(X-3Y)^2=[ 7(x-3y)]^2

4a^2=(±2a)^2
16/25X^4Y^2=(±4/5X^2Y)^2
36(X+2Y)^2=[±6(X+2Y)]^2
49(X-3Y)^2=[±7(X-3Y)]^2