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(5x+3y)*()=25x2-9y2(-0.2x-0.4y)*()=0.16y2-0.04x2(-2/3x-11y)*()=-9/4x2+121y2
题目详情
(5x+3y)*( )=25x2-9y2 (-0.2x-0.4y)*( )=0.16y2-0.04x2 (-2/3x-11y)*( )=-9/4x2+121y2
▼优质解答
答案和解析
(5x+3y)×(5x-3y)=25x²-9y²
(-0.2x-0.4y)×(0.4y-0.2x)=0.16y²-0.04x²
(-2/3x-11y)×(2/3 x -11y)=-9/4x²+121y²
若有疑问可以百度Hi、
(-0.2x-0.4y)×(0.4y-0.2x)=0.16y²-0.04x²
(-2/3x-11y)×(2/3 x -11y)=-9/4x²+121y²
若有疑问可以百度Hi、
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