⒈（-48）÷8-（-25）×（-6）;⒉（-56）÷（-12+8）+（-2）×5；⒊-4/3×（12-1又3/1-0.4）;⒋5平方-3×［-3平方+（-2）×（-3）...
⒈（-48）÷8-（-25）×（-6）; ⒉（-56）÷（-12+8）+（-2）×5； ⒊-4/3×（12-1又3/1-0.4）; ⒋ 5平方-3×［-3平方+（-2）×（-3）］+（-5）平方. ⒈玩“24点”游戏，规则如下：任取4个整数。将这4个数（每个数只用1次）进行“+、-、×、÷”四则运算，使其结果为24.
现有4个整数:3,4,-6,10,应用上述规则，写出3种不同算式: ⑴__________________ ⑵__________________ ⑶__________________.
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1.已知集合A={x|1-1≤x≤3}，B={y|x的平方=y,x∈A}，C={y|y=2x+a,x∈A}，若满足CC(下面有横线)B,求实数a的取值范围.2.设函数f(...
1.已知集合A={x|1-1≤x≤3}，B={y|x的平方=y,x∈A}，C={y|y=2x+a,x∈A}，若满足C C(下面有横线) B,求实数a的取值范围.2.设函数f(x)=1g(x-a)的定义域为A，g(x)=-2x+1,(-1≤x≤1)的值域为B.(1)若a=1,求B∩(CrA)；(2)若A∩B=∮，求a的取值范围。3.设函数f(x)=1g x+1/1-x(1)求函数y=f(x)的定义域,(2)判断并证明函数y=f(x)的奇偶性.4.已知函数f(x)=x+1/x-3(1)证明y=f(x)在[1,+∝)是增函数；(2)判断并证明y=f(x)在[1,+∝)上的零点个数。
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展开全部1 B={y|x的平方=y,x∈A}所以0≤y≤9C={y|y=2x+a,x∈A} 所以C={y|-2+a≤y≤6+a}C是B的子集 所以-2+a≥0 且6+a≤9得2≤a≤32 （1）f(x)=log(x-a)的定义域为x＞a, g(x)=-2x+1,(-1≤x≤1)的值域为 [-1，3]CrA为x≤1
B∩(CrA)=[-1,1]（2）A∩B=∮(空集)，所以a＞33
（1）设函数f(x)=log x+1/(1-x), x＞0且x≠1（2）非奇非偶 定义域不关于原点对称 ,当x≤0时无意义,4 (1)设x1,x2∈[1,+∝)
x1>x2f(x1)-f(x2)=x1+1/x1-3-x2-1/x2+3=[(x1)^2*x2-(x2)^2*x1]/(x1*x2) =(x1-x2)>0 则为增函数(2)f(x)=x+1/x-3=0x^2-3x+1=0二次方程有2解,x=[3+√5]/2>1x=[3-√5]/2<1(不合)y=f(x)在[1,+∝)上的零点个数=1
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0:-1;if(n!==r)for(var i=0;i0&&function(t,e,n,r){var i=document.getElementsByClassName(t);if(i.length>0)for(var o=0;o展开全部哎深奥展开全部哼哼，我是数学盲，哇咔咔，你掐死我吧，怎么看到这问题了...囧....
展开全部1 B={y|x的平方=y,x∈A}所以0≤y≤9C={y|y=2x+a,x∈A} 所以C={y|-2+a≤y≤6+a}C是B的子集 所以-2+a＞0 且6+a＜9得2＜a＜32 （1）f(x)=1g(x-a)的定义域为x＞a g(x)=-2x+1,(-1≤x≤1)的值域为 [-1，3]CrA为x≤1
B∩(CrA)=[-1,1]（2）A∩B=∮，所以a＞33
（1）x＞0且x≠1（2）非奇非偶 定义域不关于原点对称 当x＜0时无意义4 设x1,x2∈[1,+∝)
x1>x2ff(x1)-f(x2) >0 则为增函数因为没看明白f(x)所以做不了
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5X+（2-4X）=07X+2(3X-3)=202(X+8)=3(X-1)8X=-2(X+4)...
5X+（2-4X）=07X+2(3X-3)=202(X+8)=3(X-1)8X=-2(X+4)
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这是几道解方程的题:一元一次方程的解题步骤是1、去分母、去括号2、移项3、合并同类项4、系数化为1　　　5X+（2-4X）=01、去括号
5x+2-4x=02、移项
5x-4x=-23、合并同类项
x=-24、系数化为1
x=-27X+2(3X-3)=20,
7x+6x-6=20,
13x=26,
x=22(X+8)=3(X-1)
2x+16=3x-3,
2x-3x=-3-16,
-x=-19
x=198X=-2(X+4)
8x=-2x-8
8x+2x=-8
10x=8
x=0.8
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收起5X+（2-4X）=0 ,5x+2-4x=0 ,x=-27X+2(3X-3)=20, 7x+6x-6=20, 13x=26,x=22(X+8)=3(X-1), 2x+16=3x-3, 2x-3x=-3-16, -x=-19,,x=198X=-2(X+4) ,8x=-2x-8, 8x+2x=-8, 10x=-8, x=-0.8去括号。然后直接算就是了，这题很简单的，自己多看看书，熟悉下基本德运算就可以了。。5X+2-4X=0X=-2