网友您好, 请在下方输入框内输入要搜索的题目:
题目内容
(请给出正确答案)
求代数式的值:
(1)6x+2x²-3x+x²+1,其中x=-5 ;
(2)4x²+3xy-x²-9,其中x=2,y= -3 ;
(3)3pq-4m/5-4pq,其中m=-5,p=-1/4,q=-3/2
参考答案
更多 “ 求代数式的值:(1)6x+2x²-3x+x²+1,其中x=-5 ;(2)4x²+3xy-x²-9,其中x=2,y= -3 ;(3)3pq-4m/5-4pq,其中m=-5,p=-1/4,q=-3/2 ” 相关考题
考题
有以下程序:void f(int *x,int *y){ int *t; t=x; x=y ;y=t; *x=*y;}main(){ int a[8]={1,2,3,4,5,6,7,8},i,*p,*q; p=a;q=a[7]; while(pq) { f(p,q);p++;q--} for(i=0;i8;i++)printf("d,",a[i]);}程序运行后的输出结果是( )。A.8,2,3,4,5,6,7,1,B.5,6,7,8,1,2,3,4,C.1,2,3,4,5,6,7,8,D.8,7,6,5,4,3,2,1,
考题
下列程序的输出结果是( )。 void f(int*x,int*y) {int t; t=*x,*x=*y;*y=t; } main() {int a[8]={1,2,3,4,5,6,7,8},i,*p,*q; p=a;q=a[7]; while(p<q) {f(p,q);p++;q--;} for(i=0;i<8;i+)printf("%d,",a[i]); }A.8,2,3,4,5,6,7,1B.5,6,7,8,1,2,3,4C.1,2,3,4,5,6,7,8D.8,7,6,5,4,3,2,1
考题
化简下列各式:(1)3(xy-2z)+(-xy+3z);(2)-4(pq+pr)+(4pq+pr) ;(3)(2x-3y)-(5x-y) ;(4)-5(x-2y+1)-(1-3x+4y);(5)(2a²b-5ab)- 2(-ab-a²b) ;(6)1-3(x-½y²)+(-x+½y²)。
考题
求下列各式的值:(1)3x²-(2x² + 5x-1)-(3x+1),其中 x =10 ;(2) (xy-3y/2-1/2)-(xy-3x/2+1),其中x=10/3,y=8/3;(3)4y²-(x²+y)+(x²-4y²),其中x=-28,y=18
考题
化简下列各式:(1)5x4+3x2y-10-3x2+x-1;(2)p²+3pq+6-8p²+pq ;(3)(7y-3z)-(8y-5z);(4)-(a5-6b)-(-7+3b)(5)2(2a²+9b)+3(-5a²-4b);(6)-3(2x²-xy)+4(x²+xy-6).
考题
求下列代数式的值:1)-3x²+5x-0.5x²+x-1,其中x=2;2)1/4×(-4x2+2x-8)-(x/2-1),其中1/2;3)(5a²-3b²)+(a²+b²)-(5a²+3b²),其中a=-1,b=1;4)2(a²b+ab²)-2(a²b -1)-2ab²-2,其中a=-2,b=2.
考题
解下列方程:(1)5x/12-x/4=1/3(2)2/3-8x=3-x/2(3)0.5x-0.7=6.5-1.3x(4)(3x-6)/6=2x/5-3(5)3(x-7)+5(x-4)=15(6)4x-3(20-x)=-4(7)(y-1)/2=2-[(y+2)/5](8)(1-2x)/3=2(3x+1)/7
考题
随机变量X,Y相互独立,且分布列分别为P{X=0}=1/3;P{X=1}=2/3。P{Y=0}=1/3,P{Y=1}=2/3。则以下正确的是A、P{X=Y}=5/9B、P{X=Y}=1C、X=YD、均不正确
考题
有以下程序 void f(int *x,int *y) { int t; t=*X; *X=*y; *y=t; } main() { int a[8]={1,2,3,4,5,6,7,8},i,*p,*q; p=a; q=a[7); while(p>q) { f(p,q); p++; q--; } for(i=0; i<8; i++) printf("%d,",a[i]); } 程序运行后的输出结果是A.8,2,3,4,5,6,7,1,B.5,6,7,8,1,2,3,4,C.1,2,3,4,5,6,7,8,D.8,7,6,5,4,3,2,1,
考题
有以下程序: void f(int*x,int*y) { int t; t=*x;*x=*y;*y=t; } main() { int a [8]={1, 2,3,4,5, 6, 7,8},i,*p,*q; p=a;q=a[7]; while(p<q) {f(p,q);p++;q-;} for(i=0;i<8;i++)printf("%d,"a[i]); } 程序运行后的输出结果是 ______。A.823,4,5,6,7,1,B.5,6,7,8,12,3,4,C.1,2,3,4,5,6,7,8,D.8,7,6,5,4,3,2,1,
考题
有以下程序: voidf(int*x,int * y) { int t; t= *x;*x= *y;*y=t; } main() { inta[8]={1,2,3,4,5,6,7,8},i,*p,*q; p=a;q=a[7]; while(p) { f(p,q);p++;q--;} for(i=0;i<8;i++)printf("%d,",a[i]); } 程序运行后的输出结果是______;A.8,2,3,4,5,6,7,1,B.5,6,7,8,1,2,3,4,C.1,2,3,4,5,6,7,8,D.8,7,6,5,4,3,2,1,
考题
有以下程序:include void f(int * x,int * y) int t;t= *x; *x= *y; *y=t;main ( ){in
有以下程序:#include <stdio.h>void f(int * x,int * y) int t; t= *x; *x= *y; *y=t;main ( ){ int a[8] = { 1,2,3,4,5,6,7,8} ,i, * p, * q; p=a;q =a[7]; while(p<q) { f(p,q) ;p ++ ;q --; } for(i =0;i<8;i ++ ) printf(" % d," ,a[i]); }程序运行后的输出结果是( )。A.8,2,3,4.,5,6,7,1,B.5,6,7,8,1,2,3,4,C.1,2,3,4,5,6,7,8,D.8,7,6,5,4,3,2,1,
考题
X的分布列如表5.1-5所示。其中1≤X≤5,有关P(1<X<5)的下列说法中,正确的有( )。A.P(1<X<5)=p2+P3+P4B.P(1<X<5)=1-P(X<2)-P(X=5)C.P(1<X<5)=1-p1-p5D.P(1<X<5)=P(2≤X≤5)E.P(1<X<5)=P(1≤X≤4)
考题
过点(4,-1,3)且平行于直线L:(x-3)/2=y=(z-1)/5的直线方程为( ).A.(x-4)/2=(y+1)/0=(z-3)/5
B.(x-4)/2=(y+1)/1=(z-3)/5
C.(x+4)/2=(y-1)/0=(z+3)/5
D.(x+4)/2=(y-1)/1=(z+3)/5
考题
单选题Which of the following choices could be equal to set Z ifX = {2, 5, 6, 7, 9} and Y = {2, 5, 7}X ∪ Y ∪ Z = {1, 2, 3, 4, 5, 6, 7, 8, 9}X ∩ Z = {2, 6}Y ∩ Z = {2}A
Z= {1, 4, 8}B
Z= {1, 3, 8}C
Z= {1, 3, 4, 8}D
Z= {1, 2, 3, 4, 6, 8}E
Z= {1, 2, 3, 5, 6, 8}
考题
多选题X的分布列如表所示。其中1≤X≤5,有关P(1<X<5)的下列说法中,正确的有( )。AP(1<X<5)=p2+p3+p4BP(1<X<5)=1-P(X<2)-P(X=5)CP(1<X<5)=1-p1-p5DP(1<X<5)=P(2≤X≤5)EP(1<X<5)=P(1≤X≤4)
考题
单选题欧拉方程x2d2y/dx2+4xdy/dx+2y=0(x>0)的通解为( )。A
c1/x+c2/x2(其中c1,c2为任意常数)B
c1/x2+c2/x3(其中c1,c2为任意常数)C
c1/x3+c2/x4(其中c1,c2为任意常数)D
c1/x4+c2/x5(其中c1,c2为任意常数)
考题
单选题二阶常系数非齐次线性微分方程y″-4y′+3y=2e2x的通解为y=( )。A
C1x+C2x3+2e2x(其中C1,C2为任意常数)B
C1x+C2x3-2e2x(其中C1,C2为任意常数)C
C1ex+C2e3x-2e2x(其中C1,C2为任意常数)D
C1ex+C2e3x+2e2x(其中C1,C2为任意常数)
考题
单选题已知两直线l1:x/2=(y+2)/-2=(1-x)/-1和l2:(x-1)/4=(y-3)/M=(z+1)/-2相互垂直,则M的值为:()A
3B
5C
-2D
-4
热门标签
最新试卷