计算:(x-y)的平方-2x(x-y)
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计算:(x-y)的平方-2x(x-y)
计算:(x-y)的平方-2x(x-y)
计算:(x-y)的平方-2x(x-y)
(x-y)的平方-2x(x-y)
=(x-y)(-x-y)
(x-y)的平方-2x(x-y)
=(x-y)(x-y-2x)
=(x-y)(-y-x)
= -(x-y)(x+y)
y^2-x^2
原式=x^2+y^2-2xy-(2x^2-2xy)
=y^2-x^2
syms x y
>> simple((x-y)^2-2*x*(x-y))
simplify:
y^2 - x^2
radsimp:
(x - y)^2 - 2*x*(x - y)
simplify(100):
y^2 - x^2
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syms x y
>> simple((x-y)^2-2*x*(x-y))
simplify:
y^2 - x^2
radsimp:
(x - y)^2 - 2*x*(x - y)
simplify(100):
y^2 - x^2
combine(sincos):
(x - y)^2 - 2*x*(x - y)
combine(sinhcosh):
(x - y)^2 - 2*x*(x - y)
combine(ln):
(x - y)^2 - 2*x*(x - y)
factor:
-(x - y)*(x + y)
expand:
y^2 - x^2
combine:
(x - y)^2 - 2*x*(x - y)
rewrite(exp):
(x - y)^2 - 2*x*(x - y)
rewrite(sincos):
(x - y)^2 - 2*x*(x - y)
rewrite(sinhcosh):
(x - y)^2 - 2*x*(x - y)
rewrite(tan):
(x - y)^2 - 2*x*(x - y)
mwcos2sin:
(x - y)^2 - 2*x*(x - y)
collect(x):
- x^2 + y^2
ans =
y^2 - x^2
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