挑战习题
1
/5
单选题
难度:
1.方程(x-2)(x+3)=0的解是( )
A
B
C
D
提示1:
IOaWueeoi+WIqeeUqOS4pOaVsOebuOS5mOenr+S4ujDvvIw=
提示2:
IOS4pOWboOW8j+S4reiHs+WwkeacieS4gOS4quS4ujDovazljJbkuLrkuKTkuKrkuIDlhYPkuIDmrKHmlrnnqIvmnaXmsYLop6M=
提示3:
IOino+S4gOWFg+S6jOasoeaWueeoiy3lm6DlvI/liIbop6Pms5U=
正确答案:
RA==
PGRpdj7op6PvvJrvvIh4LTLvvInvvIh4KzPvvIk9MO+8jDxicj7lj6/lvpd4LTI9MOaIlngrMz0w77yMPGJyPuino+W+l++8mng8c3ViPjE8L3N1Yj49Mu+8jHg8c3ViPjI8L3N1Yj49LTMuIDxicj7mlYXnrZTmoYjkuLrvvJp4PHN1Yj4xPC9zdWI+PTLvvIx4PHN1Yj4yPC9zdWI+PS0zPC9kaXY+
2
/5
单选题
难度:
2.方程(x+1)(x-2)=x+1的解是( )
A
2
B
3
C
D
提示1:
IOWFiOenu+mhueW+l+WIsO+8iHgrMe+8ie+8iHgtMu+8iS3vvIh4KzHvvIk9MA==
提示2:
IOeUqOaPkOWFrOWboOW8j+WboOW8j+WIhuinow==
提示3:
IOWMluS4uuS4pOS4quS4gOWFg+S4gOasoeaWueeoi++8jOino+aWueeoi+WNs+WPrw==
正确答案:
RA==
PGRpdj7op6PvvJrvvIh4KzHvvInvvIh4LTLvvIkt77yIeCsx77yJPTDvvIw8YnI+4oi077yIeCsx77yJ77yIeC0yLTHvvIk9MO+8jOWNs++8iHgrMe+8ie+8iHgtM++8iT0w77yMPGJyPuKItHgrMT0w77yM5oiWeC0zPTDvvIw8YnI+4oi0eDxzdWI+MTwvc3ViPj0tMe+8jHg8c3ViPjI8L3N1Yj49My4gPGJyPuaVhemAiUQuIDwvZGl2Pg==
3
/5
单选题
难度:
3.一元二次方程x
2
+3x-4=0的解是( )
A
x
1
=1,x
2
=
B
x
1
=
,x
2
=4
C
x
1
=
,x
2
=
D
x
1
=1,x
2
=4
提示1:
IOWboOW8j+WIhuino+azleino+aWueeoiw==
提示2:
IOWNgeWtl+ebuOS5mOazlQ==
正确答案:
QQ==
PGRpdj7op6PvvJp4PHN1cD4yPC9zdXA+KzN4LTQ9MDxicj7vvIh4LTHvvInvvIh4KzTvvIk9MDxicj7op6PlvpfvvJp4PHN1Yj4xPC9zdWI+PTHvvIx4PHN1Yj4yPC9zdWI+PS0077ybPGJyPuaVhemAiUEuIDwvZGl2Pg==
4
/5
单选题
难度:
4.已知关于x的方程x
2
-ax+b=0的两个根是x
1
=-1,x
2
=2,则二次三项式x
2
-ax+b可以分解为( )
A
(x+1)(x+2)
B
(x+1)(x-2)
C
(x-1)(x+2)
D
(x-1)(x-2)
提示1:
IOi/kOeUqOWboOW8j+WIhuino+azleWPjeWQkeaxguaWueeoi+eahOWIhuino+W8jw==
正确答案:
Qg==
PGRpdj7op6PvvJriiLV4PHN1Yj4xPC9zdWI+PS0x77yMeDxzdWI+Mjwvc3ViPj0y77yMPGJyPuKItOWOn+aWueeoi+S4uu+8mu+8iHgrMe+8ie+8iHgtMu+8iT0wLiA8YnI+5pWF6YCJQi4gPC9kaXY+
5
/5
单选题
难度:
5.三角形两边长分别为3和6,第三边是方程x
2
-6x+8=0的解,则这个三角形的周长是( )
A
11
B
13
C
11或13
D
不能确定
提示1:
IOeUqOWboOW8j+WIhuino+axguWHuuaWueeoi+eahOS4pOS4quaguQ==
提示2:
IOagueaNruS4ieinkuW9ouS4iei+ueeahOWFs+ezu+ehruWumuS4ieinkuW9ouesrOS4iei+ueeahOmVvw==
提示3:
IOiuoeeul+WHuuS4ieinkuW9oueahOWRqOmVvw==
正确答案:
Qg==
PGRpdj7op6PvvJrvvIh4LTLvvInvvIh4LTTvvIk9MDxicj54LTI9MOaIlngtND0wPGJyPuKItHg8c3ViPjE8L3N1Yj49Mu+8jHg8c3ViPjI8L3N1Yj49NC4gPGJyPuWboOS4uuS4ieinkuW9ouS4pOi+ueeahOmVv+WIhuWIq+S4ujPlkow277yM5omA5Lul56ys5LiJ6L6555qE6ZW/5Li6NO+8jDxicj7lkajplb89Mys2KzQ9MTMuIDxicj7mlYXpgIlCLiA8L2Rpdj4=