很簡單，見到有（=）的就是 equation，沒有的就是 expression ，所以 1, 4 係 equation而 2, 3 係 expression 。
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Expressions for the gradient in 2 dimensions(2維梯度表示法) ▽f(x,y)= ( ∂ f/&part...
Factorize the following expressions . (a) (x^2-y^2)+2x-2y 解: (x^2-y^2)+2x-2y =(x-y)(x+y)+2(x-y) =(x-y)(x+y+1...
... solution)不是正式的名稱，它的正式名稱是Closed-form expression ，請參考wiki: http://en.wikipedia.org/wiki/Closed-form_ expression "非解析函數...
xyz + x'y'z + x'yz' + x'yz + xz + y'z + y'z' + xz' = xyz + x'y'z + ( x'yz' + x'yz ) + (xz + xz' ) + ( y'z + y'z' ) , 交換律 = xyz + x'y'z + x'y(z'+z) + x(z+z' ) + y'(z+z' ) , 分配律 = xyz + x'y'z + x'y + x + y' = ( xyz + x ) + ( x'y'z + y'...
1. Simplify the following expressions . (a) [(4x^2-y^2)/(9x^2+6x+1)][(3x+1)/(2x+y)] =[(2x-y)(2x+y)*(3x+1)]/[(3x+1)^2*(2x+y)] =(2x-y)/(3x+1) Ans: (2x-y)/(3x+1)
... proofs(below) are more geometric in that they treat an expression such as a cos γ merelyas a label for the length of a certain line segment...
...8 * (1^6) + 8 * (1^3) + 1 8 * (2^6) + 8 * (2^3) + 1 ... 再按下"Factor Expressions "鍵,就能得知這些數的因式分解了.
