连续的三个奇数的和为33,则这三个数为().
As soon as I entered Evan"s company I saw a board________"________ to Evans".
A. reads; WelcomedB. written; to WelcomeC. reading;WelcomeD. printed; Welcame
A. reads; WelcomedB. written; to WelcomeC. reading;WelcomeD. printed; Welcame
W_____(星期三) is the fourth day of the week.
Jack packed all the things into a case, ____________.
A. being anxiously to leaveB. to be anxious to leaveC. anxious to leaveD. be anxious to leave
A. being anxiously to leaveB. to be anxious to leaveC. anxious to leaveD. be anxious to leave
在下列数:-(-12),-42,-|-9|,227,(-1)2004,0中,正数有a个,负数有b个,正整数有c个,负整数有d个,则a+b+c+d的值为()
A.8B.9C.10D.11
A.8B.9C.10D.11
若x2-mx+4是完全平方式,则m=______.
按要求进行移项:把下列方程中的所有含未知数的项移到方程的左边,常数项移到方程的右边.(1)3x-5=-4x+3+2x;(2)-45x-25=-925+125x.
Thereisapieceofwork.IttakesMr.Aalone20daystofinish,andMr.B30alonedaystofinish.Ittakesthem()daystoworktogethertofinishthework.
A.10B.12C.15D.50
A.10B.12C.15D.50
若(3xy+2)2+|7-x-y|=0,求代数式(5xy+10y)-[-5x-(4xy-2y+3x)]的值.
数学竞赛成绩85分以上的为优秀,以85分为基准作简记,如89分记作+4,81分记作-4,老师将某班六名同学实际成绩记为:+9、-5、0、+6、-3、-1,这六名同学的成绩依次是:__________________。
小明体重55千克,其中用到的数是属()
A.计数B.测量C.标号D.排序
A.计数B.测量C.标号D.排序
若一次函数y=kx+b交于y轴的负半轴,且y的值随x的增大而减少,则k()0,b()0.(填“>”、“<“=”)
下列运算正确的是()
A.4=2B.(-3)2=-9C.2-3=8D.20=0
A.4=2B.(-3)2=-9C.2-3=8D.20=0
下列从左到右的变形中,是分解因式的是[]
A.a(x+y)=ax+ayB.x2-4x+4=x(x-4)+4C.10x2-5x=5x(2x-1)D.x2-16+3x=(x+4)(x-4)-16
A.a(x+y)=ax+ayB.x2-4x+4=x(x-4)+4C.10x2-5x=5x(2x-1)D.x2-16+3x=(x+4)(x-4)-16
计算:(1)aa-b+bb-a(2)1x+2-x2+2x+1x+2÷x2-1x-1.
计算:2cos30°+tan45°+16+(-14)-1.
不等式x+3≤6的正整数解为______.
化简求值:[(x+2y)2-(x-2y)2-(x+2y)(x-2y)-4y2]÷2x,其中x=-2,y=12.
下列数中是无理数的是()
A.0.12?2?3B.π2C.0D.227
A.0.12?2?3B.π2C.0D.227
若方程3x+(2a+1)=x-(3a+2)的解是0,则a的值是()
A.15B.35C.-15D.-35
A.15B.35C.-15D.-35