251 五年级数学单元测试系列一之第四单元测试4 附答案

1、化简

8a+5b-b                                           5a-a-b-3b                                         6a·3-18b÷9

b+b-(m+m)                                      b+b-m+m                                        ab-b+b

5x+4x                                              78t+22t-t                                         10a-6a-3a

9c-8c-1                                            6x·(2+3)                                       4a+7b-3a-5b

3x+4y-2x                                         12a÷4+4b×2                                8m·5+6m

3、选择

(1)2a×b的简便形式写成(    )。

A.b×2a                                          B.2a·b                             C.b2a                          D.2ab

(2)当a=8时，3a+5a-2a的值是(    )。

A.80                                         B.24                                  C.48                           D.64

(3)有三个连续整数，其中最小的整数是n,那么，最大的整数是(    )。

A.n-1                                        B.n+1                                C.n+2                         D.n+3

(4)小胖比妈妈小28岁，过了x年，小胖比妈妈小(    )。

A.28                                         B.x                                    C.28+x                       D.2x

251 五年级数学单元测试系列一之第四单元测试4答案

1、化简

8a+4b           4a-4b            18a-2b

2b-2m           2b                 ab

9x                 99t                a

c-1                30x               a+2b

x+4y             3a+8b           46m

3、选择

(1) D             (2) C           (3)C     (4)A