.*是矩阵点乘,则要求参与运算的矩阵必须是相同维数的,是每个对应元素的逐个相乘.
x=[-2.5:0.25:2.5];y=exp(-x.*x);stairs(x,y);title('stairs plo
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x=[-2.5:0.25:2.5];y=exp(-x.*x);stairs(x,y);title('stairs plo
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1.{2x+y=-2,2x-y=6 2.{0.25x-0.5y=2,0.4x+0.25y=20
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已知x>=0,y>=0,求证0.5(x+y)^2+0.25(x+y)>=x√y+y√x
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（x+5y)(x-5y）等于A.25y2-x2B.x2+25y2C.x2-25y2D.x2+10xy+25y2
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0.25x-0.5y=2,0.4x+0.25y=20,x,y等于
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(5x^4-10x^3y+25x^2y^2)/(-5x^2)
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因式分解-5a^2+25a;25x^2-16y^2;x^3-25x;x^2(x-y)+y^2(y-x);x^2y^4-1
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一道数额学题 若{(x,y)|x-2y+5≥0,3-x≥0,y≥-(4/3)x+b}⊂{(x,y)|x^2+y^2≤25
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二元二次方程组求解(5√2 )x=25+x^2-y^2xy=x^2+y^2-25[(5√6-5√2)/2]y=25+y^
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(5x^4-10x^3y+25x^2y^2)除以(-5x^2)=_____________________