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共找到 860441 与-b 相关的结果，耗时208 ms
a^2
-b
^2+4b =(a+b)*(a
-b
)+4b =2(a
-b
)+4b =2(a+b) =4 =(a+b)*(a
-b
)+4b =2(a
-b
)+4b怎么得的a^2
-b
^2+4b =(a+b)*(a
-b
)+4b =2(a
-b
)+4b =2(a+b) =4=(a+b)*
数学
a-b)+4b =2(a-b
对任意的a、b∈R，定义：min{a，b}=a，(a
-b③（min{a，b}）•（m
数学
max{a，b}）=a•b④
matlab-1/18*pi*(2*a+3
-b
)^2*(2*a
-b
-6)+1/18*pi*(-6*a+3
-b
)^2*(6*a+b+6)+(9*asin(-1/3*b-2*a)*b+54*asin(-1/3*b-2*a)*a-9*(9-12*b*a-36*a^2
-b
^2
数学
)^(1/2)+1/3*(9
已知a、b属于R+,且a不等于b,求证：a4+b4大于a3b+ab3a^4+b^4-a^3b-ab^3=a^3(a
-b
)+b^3(b-a)=(a^3
-b
^3)(a
-b
)∵a、b属于R+,且a不等于b∴(a^3
-b
^3)和(a
-b
)一定同号∴=(a^3
-b
^3)(a
-b
数学
(a-b)>0 ∴a^4+b
已知向量a与b反向,下列等式成立的是：A：|a|-|b|=|a
-b
|B:|a+b|=|a
-b
已知向量a与b反向,下列等式成立的是：A：|a|-|b|=|a
-b
|B:|a+b|=|a
-b
|C:|a|+|b|=|a
-b
|D:|a|+|b|=|a+b|
数学
集合的运算1.已知A={1,2,3,4},B={3,4,5},求A交集B,A并集B.2.已知A={a,b,c,d},B={b,d,e,f},求A交集B,A并集B.3.图示说明:如果A包含B,则A交集B=A,A并集B=B.4.已知A={x|x的平方-9=0},B={x|
数学
-3=0},求A交集B,A并
下列各式合并同类项结果正确的是（）A.-a+b=-(a+b)B.-a+b=-(b+a)C.-a
-b
=-(a+b)D.-a
-b
=-(a
-b
)下列各式合并同类项结果正确的是（）A.-a+b=-(a+b)B.-a+b=-(b+a)C.-a
-b
=-(a+b)D.-a
-b
=-(
数学
-b)
定义运算a*b=a(1
-b
),下面给出了几个结论：1.a*b=b*a2.若a+b=0,则(a*a)+(b*b)=2ab3.若a*b=0,则a=0...定义运算a*b=a(1
-b
),下面给出了几个结论：1.a*b=b*a2.若a+b=0,则(a*a)+(b*b)=2ab3
数学
ab 3.若a*b=0,则a
阅读:例:已知1/a+1/b=5/a+b,求b/a+a/b的值.因为1/a+1/b=5/a+b,所以a+b/a+a+b/b=5,所以a/a+b/a+a/b+b/b=5,所以b/a+a/b=3.请你发挥自己的才智解答下列问题:已知3x+2y=6,xy=3,求2/x+3/y
数学
的值.
法国数学家笛卡尔曾经说过：“天下的事理……”（此处没用）设a=b≠0,则有a²=b²,a²
-b
²=0,(a+b)(a
-b
)=0.两边除以(a
-b
),得(a+b)(a
-b
)/a
-b
=0/a
-b
.因为(a+b)(a
-b
)/a
-b
=a+b,0/
数学
a-b=0,所以a+b=0,
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