挑战习题
1
/5
单选题
难度：
1.如果单项式-3x
a
y
2
与x
3
y
b
是同类项，则这两个单项式的和是（ ）
A
2x
2
y
2
B
-2x
3
y
2
C
-2x
6
y
4
D
-3x
3
y
2
提示1：
IOaYjuehruWQjOexu+mhueeahOWumuS5ie+8jOKAnOWtl+avjeebuOWQjO+8jOebuOWQjOWtl+avjeeahOaMh+aVsOebuOWQjOKAne+8jOaxguWHumEsYu+8mw==
提示2：
IOWvueWQjOexu+mhuei/m+ihjOWQiOW5tu+8mw==
提示3：
IOazqOaEj+espuWPt+eahOWPmOWMlg==
正确答案：
Qg==
PGRpdj7op6PvvJriiLXljZXpobnlvI8tM3g8c3VwPmE8L3N1cD55PHN1cD4yPC9zdXA+5LiOeDxzdXA+Mzwvc3VwPnk8c3VwPmI8L3N1cD7mmK/lkIznsbvpobnvvIw8YnI+4oi0YT0z77yMYj0yLiA8YnI+5Luj5YWlLTN4PHN1cD5hPC9zdXA+eTxzdXA+Mjwvc3VwPit4PHN1cD4zPC9zdXA+eTxzdXA+Yjwvc3VwPu+8jDxicj49LTN4PHN1cD4zPC9zdXA+eTxzdXA+Mjwvc3VwPit4PHN1cD4zPC9zdXA+eTxzdXA+Mjwvc3VwPu+8jDxicj49LTJ4PHN1cD4zPC9zdXA+eTxzdXA+Mjwvc3VwPi4gPGJyPuaVhemAiUIuIDwvZGl2Pg==
2
/5
单选题
难度：
2.下列计算正确的是（ ）
A
3x
2
+2x
3
=5x
5
B
4y
2
-y
2
=3
C
x+2y=3xy
D
3x
2
y+yx
2
=4x
2
y
提示1：
IOagueaNruWQjOexu+mhueeahOamguW/te+8jOWFiOehruWumuWQjOexu+mhue+8mw==
提示2：
IOagueaNruWQiOW5tuWQjOexu+mhueeahOazleWImei/m+ihjOi/kOeul++8mw==
提示3：
IOazqOaEj+WQiOW5tuWQjOexu+mhueaXtuespuWPt+eahOWPmOWMluOAgg==
正确答案：
RA==
PGRpdj7op6PvvJpB44CBM3g8c3VwPjI8L3N1cD7kuI4yeDxzdXA+Mzwvc3VwPuS4jeaYr+WQjOexu+mhue+8jOS4jeiDveWQiOW5ti4g6ZSZ6K+v77ybPGJyPkLjgIE0eTxzdXA+Mjwvc3VwPi15PHN1cD4yPC9zdXA+PTN5PHN1cD4yPC9zdXA+LiDplJnor6/vvJs8YnI+Q+OAgXjkuI4yeeS4jeaYr+WQjOexu+mhue+8jOS4jeiDveWQiOW5ti4g6ZSZ6K+v77ybPGJyPkTjgIEzeDxzdXA+Mjwvc3VwPnkreXg8c3VwPjI8L3N1cD49NHg8c3VwPjI8L3N1cD55LiDmraPnoa4uIDxicj7mlYXpgIlELiA8L2Rpdj4=
3
/5
单选题
难度：
3.
计算 -2a
2
-2a
2
，结果是（ ）
A
0
B
-4a
2
C
2a
2
D
-6a
2
提示1：
PHA+5rOo5oSP56Gu5a6a57O75pWw55qE56ym5Y+377ybPC9wPg==
提示2：
PHA+5Lil5qC85oyJ54Wn5ZCI5bm25ZCM57G76aG55rOV5YiZ77yM57O75pWw55u45Yqg5YeP77ybPC9wPg==
提示3：
PHA+5rOo5oSPMOS5mOS7u+S9leaVsOS7jeaYrzA8L3A+
正确答案：
Qg==
PGRpdj7op6PvvJrljp/lvI89Wy0yK++8iC0y77yJXWE8c3VwPjI8L3N1cD49LTRhPHN1cD4yPC9zdXA+Ljxicj7mlYXpgIlDLjwvZGl2Pg==
4
/5
单选题
难度：
4.
合并同类项：3xy-4xy+2yx=（ ）
A
-2xy
B
-xy+2yx
C
5xy-4yx
D
xy
提示1：
PHA+5a+75om+5ZCM57G76aG577yM4oCc5a2X5q+N55u45ZCM77yM55u45ZCM5a2X5q+N55qE5oyH5pWw55u45ZCM4oCd77ybPGJyPjwvcD4=
提示2：
PHA+5qC55o2u5ZCI5bm25ZCM57G76aG555qE5rOV5YiZ77ya5a2X5q+N5ZKM5a2X5q+N55qE5oyH5pWw5LiN5Y+YLOaKiuWQjOexu+mhueeahOezu+aVsOebuOWKoO+8jOaJgOW+l+e7k+aenOS9nOS4uuezu+aVsO+8mzxicj48L3A+
正确答案：
RA==
PGRpdj7op6PvvJrljp/lvI8977yIMy00KzLvvIl4eTxicj49eHkuPGJyPuaVhemAiUQuPC9kaXY+
5
/5
单选题
难度：
5.下列各式计算正确的是（ ）
A
6a+a=6a
2
B
3ab
2
-5b
2
a=-2ab
2
C
4m
2
n-2mn
2
=2mn
D
-2a+5b=3ab
提示1：
IOagueaNruWQjOexu+mhueeahOWumuS5ie+8jOaJgOWQq+Wtl+avjeebuOWQjO+8jOebuOWQjOWtl+avjeeahOasoeaVsOebuOWQjO+8jOS7peWPiuWQiOW5tuWQjOexu+mhueazleWIme+8jOWPquaKiuezu+aVsOebuOWKoOWHj++8jOWtl+avjeS4juWtl+avjeeahOasoeaVsOS4jeWPmO+8mw==
提示2：
IOazqOaEj+espuWPt+eahOmXrumimO+8mw==
正确答案：
Qg==
PGRpdj7op6PvvJpB44CBNmErYT03Ye+8jOaVheacrOmAiemhuemUmeivr++8mzxicj5C44CBM2FiPHN1cD4yPC9zdXA+LTViPHN1cD4yPC9zdXA+YT3vvIgzLTXvvIlhYjxzdXA+Mjwvc3VwPj0tMmFiPHN1cD4yPC9zdXA+77yM5pWF5pys6YCJ6aG55q2j56Gu77ybPGJyPkPjgIE0bTxzdXA+Mjwvc3VwPm7kuI4ybW48c3VwPjI8L3N1cD7vvIzkuI3mmK/lkIznsbvpobnkuI3og73lkIjlubbvvIzmlYXmnKzpgInpobnplJnor6/vvJs8YnI+ROOAgS0yYeS4jjVi77yM5LiN5piv5ZCM57G76aG55LiN6IO95ZCI5bm277yM5pWF5pys6YCJ6aG56ZSZ6K+vLiA8YnI+5pWF6YCJQi4gPC9kaXY+