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1.x23sin-x≠0(2)y=
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2.2(l y)/l2, 0 y lfY(y) 。0, 其 他
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3.13、设y=y(x)满足y" 2y y=0,且y(0)=0,y(0)=1,则y(x)dx
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4.20.G:x 2 y 2 -2x- √ 2 \sqrt{2} y=0经过椭圆 x 2 a 2 \frac{{x}^{2}}{{a}^{2}} y 2 b 2 \frac{{y}^{2}}{{b}^
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5.对于 int x, y;语句 if (x < 0) y = -1; else if (x==0) y = 0; else y = 1;等价于
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6.若集合A={x|A、(-∞,0]∪( 2 2 , ∞)B、( 2 2 , ∞)C、(-∞,0]∪[ 2 2 , ∞)D、[ 2 2 , ∞)
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7.(4)y" -( )y' y=0, y=Ce C,e
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8.What is the output for y?int y = 0;for (int i = 0; i<10; ++i) { y += i; }System.out.println(y);
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9.Given signal x[n]={1.1,1,1,1} and y[n]=n+1 (0≤n≤2), then the linear convolution of x[n] and y[n] is (
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10.(1)2x 3y-1=0 (2)2x-y 5=0(3)4x y-6=0 或 3x 2y-7=0 (4) 3x y = 0或 x - y 4 = o.