挑战习题
1
/5
单选题
难度:
1.计算(-3x
2
)·2x
3
的结果是( )
A
-6x
5
B
-3x
5
C
2x
5
D
6x
5
提示1:
5Y2V6aG55byP5LmY5Lul5Y2V6aG55byP77yM57O75pWw5LiO5ZCM5bqV5bmC5YiG5Yir55u45LmY77yM5b6X5Yiw55qE57uT5p6c5L2c5Li656ev55qE5q+P5LiA6aG5
正确答案:
QQ==
6Kej562U77ya4oi1KC0zeDxzdXA+Mjwvc3VwPinCtzI8aW1nIHdpZHRoPTE1IGhlaWdodD0yMSBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzNFL0E1L3JCQUNKbFRJa2wtRDl6U09BQUFCT2pxOUhwODA0MC5wbmciPj08aW1nIHdpZHRoPTMzIGhlaWdodD0yMSBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzczLzE5L3JCQUNFMVRJa2wtUkprSE1BQUFCZUc4a1Q0dzk5My5wbmciPjxicj7mlYXpgIlB
2
/5
单选题
难度:
2.下列运算正确的是( )
A
-3(x-1)=-3x-1
B
-3(x-1)=-3x+1
C
-3(x-1)=-3x-3
D
-3(x-1)=-3x+3
提示1:
5Y2V6aG55byP5LmY5Lul5aSa6aG55byP562J5LqO5Y2V6aG55byP5LiO5aSa6aG55byP55qE5q+P5LiA6aG55YiG5Yir55u45LmY77yM5oqK5LmY56ev55u45Yqg
正确答案:
RA==
6Kej562U77ya4oi1LTMoeC0xKT0tM3grMzxicj7mlYXpgIlE
3
/5
单选题
难度:
3.
若a
3
(3a
n
-2a
m
+4a
k
)=3a
9
—2
+4a
4
,则m,n,k的值分别为( )
A
6,3,1
B
3,6,1
C
2,1,3
D
2,3,1
提示1:
PHA+5Y2V6aG55byP5LmY5Lul5aSa6aG55byP562J5LqO5Y2V6aG55byP5LiO5aSa6aG55byP55qE5q+P5LiA6aG55YiG5Yir55u45LmY77yM5oqK5LmY56ev55u45YqgPC9wPg==
正确答案:
Qg==
PHA+6Kej562U77ya4oi1YTxzdXA+Mzwvc3VwPigzYTxzdXA+bjwvc3VwPi0yYTxzdXA+bTwvc3VwPis0YTxzdXA+azwvc3VwPik9MzxpbWcgZGF0YS1ja2Utc2F2ZWQtc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8zRS9FMy9yQkFDSjFUSWttbkRzNGlhQUFBRG11MFJ2WncwNDAucG5nIiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzNFL0UzL3JCQUNKMVRJa21uRHM0aWFBQUFEbXUwUnZadzA0MC5wbmciIHdpZHRoPSIyNTUiIGhlaWdodD0iMjEiPjxicj7iiLRuPTYsbT0zLGs9MTsg5oyJ6aKY5Lit6aG65bqP5Y2zbT0z77yMbj0277yMaz0xPGJyPuaVhemAiUI8YnI+PC9wPg==
4
/5
单选题
难度:
4.适合2x(x-1)-x(2x-5)=12的x的值为( )
A
2
B
1
C
C
3
D
4
提示1:
5Y2V6aG55byP5LmY5Lul5aSa6aG55byP562J5LqO5Y2V6aG55byP5LiO5aSa6aG55byP55qE5q+P5LiA6aG55YiG5Yir55u45LmY77yM5oqK5LmY56ev55u45Yqg
正确答案:
RA==
6Kej562U77ya4oi1MngoeC0xKS14KDJ4LTUpPTI8aW1nIHdpZHRoPTE4NiBoZWlnaHQ9MjEgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC9BQS8xRS9yQkFDRkZUSWtteVROdDRIQUFBQ2FINmVtRkU1MjUucG5nIj48YnI+4oi0eD00PGJyPuaVhemAiUQ=
5
/5
单选题
难度:
5.下列等式中,正确的是 ( )①3a
3
·4a
4
=7a
12
②4m
5
·3m
2
=12m
10
③x
2
·x·x
5
=x
8
④(-3x)·2xy-x
2
y=-7x
2
y
A
①②
B
②③
C
③④
D
①③
提示1:
5ZCM5bqV5bmC55u45LmY77yM5bqV5pWw5LiN5Y+Y77yM5oyH5pWw55u45Yqg
提示2:
5Y2V6aG55byP5LmY5Lul5Y2V6aG55byP77yM57O75pWw5LiO5ZCM5bqV5bmC5YiG5Yir55u45LmY77yM5b6X5Yiw55qE57uT5p6c5L2c5Li656ev55qE5q+P5LiA6aG5
正确答案:
Qw==
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