If a+b=0,then the equation ax+b=0 for x has( )(A)only one root(B)only one root or no root(C)only one root or infinite roots(D)no root or infinite rootsinfinite roots:无穷多个根

if[[$#-eq 1]] then a=$1 fi shell程序里面这个是什么意思呀 A=2:b=1:c=0 if a then if b then if c then Print “1” else Print “2” else Print “3” else Print if a==0 then return; 再麻烦你一个问题,这一空填什么 final= cp( ){local finalif [ $# -eq 1 ] ; then ## Only one arg,command cp -b $1 .## so copy it to the current directoryelsefinal= if [ -d $final ] ; then command cp -b $@ ## copy all the files into it If the root equation (a²-1)x+5|b|-10=0 had inn,(a,b) is a pair of the real number,then the pair of real number (a,b) is ( ) If A=1,B=2,C=3...Z=26,then how much is the word ATTITUDE? If a@b=(3xb)then the value of 2+(2xa)@(3@5)is急 与if Option1.value=true then这条语句不等价的是?A）if option1.value then B）if option1=true C) if value=true then D）if option1 then 英语翻译If the linear function y=ax+b passes through the point (-2,0),but not the first Quadrant,then the solution set for ax>b is ( ). if a方+b方>0,then the equation ax+b=0 for x has ()A、only one root（根） B、no root C、infinite roots（无数根） D、only one root or no root 一道简单的英语数学题：If x²-7x+9=(x+a)²+b for all x,then what are the values of a and b 英语奥数竞赛题：If a ⊕b =(3×b) then the value of 2+(2×a) ⊕(3⊕5)is 是什么意思,怎么解答? #define EQ(a,b) ((a)=(b))是什么意思? If =a(a+1)/2 for all integres a and b =,then is( ) 翻译成四元式 编译原理if a or b >0 then while c>0 do c:=c+d 行列式的问题 对称矩阵Let A and B be n × n matrices.Which of the following statements are always true?(i) If det(A) = det(B) then det(A − B) = 0.(ii) If A and B are symmetric,then the matrix AB is also symmetric.若A对称 lingo 代码输出的值为什么不是0和1model:max=@if(a1 #ne# 0,0.7,0)+@if(a1+a2 #eq# 0,0,@if(a1+a2 #eq# 1,0.7,1))+@if(a2 #ne# 0,0.7,0)+@if(a1+a3 #eq# 0,0,@if(a1+a3 #eq# 1,0.7,1))+@if(a2+a4 #eq# 0,0,@if(a2+a4 #eq# 1,0.7,1))+@if(a4 #ne# 0,0.7,0)+@ 麻烦吧 全部选择答案 写出来9．下列JavaScript的判断语句中（ A ）是正确的.A．if(a==0) B．if(a=0)C．if a==0 then D．if a=0 then10．下列JavaScript的判断语句中（ B ）是正确的.A．if(a0) then B．if(a!=0)C．if