六年级数学总复习试题-解比例专项练 人教版（含答案）.docx

解比例
一、单选题
1.求未知数x．
x∶ 17 ＝ 12
x＝(   )
A. 16                                         B. 0.2                                         C. 114                                         D. 5
2.求比的未知项．
x∶2＝ 14    x＝     
A. 3                                           B. 14                                           C. 12                                           D. 6
3.解比例
15∶x=60∶20
x=（   ）
A. 4                                         B. 2.4                                         C. 4.2                                         D. 5
4.求比的未知项．
40∶x＝ 1100
x＝（   ）
A. 20                                      B. 313                                      C. 4000                                      D. 150
5.求未知数x．
x∶12.8＝10∶8
x＝(   )
A. 16                                         B. 0.2                                         C. 114                                         D. 5
6.解比例
x∶6.5=4∶3.25
x=(   )
A. 110                                         B. 8                                         C. 15                                         D. 10
7.解比例
4.85.6=0.6x ，x=(   )
A. 1.5                                        B. 0.7                                        C. 5.7                                        D. 5[来源:学科网]
8.解比例．
6x=20.75
x＝（   ）
A. 10                                        B. 8                                        C. 2.25                                        D. 40
9.在分数 25 的分子和分母上，同时加上一个相同的整数得到的新分数是 23 ，所加的这个整数是（   ）
A. 2                                           B. 4                                           C. 5                                           D. 7
10.用放大6倍的放大镜看15°的角，则看到这个角的度数（  ）
A. 不变                                     B. 缩小6倍                                     C. 扩大6倍
二、填空题
11.解比例：3.6：5.4=15：x,则x=________
12.解比例
X:0.18=6.5:0.15,则x=________
13.1400000=x800000
X=________