1 . 计算下面各题,结果用分数表示。
9÷19= 17÷13=
37秒=
分 89公顷=
平方千米
9÷19= 17÷13=
37秒=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da71882dfab44c29662407ef9acb209.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da71882dfab44c29662407ef9acb209.png)
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2 . 直接写出得数。
13秒
( )分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b342d87072d32d9f569caf64e1950b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07fd87c079d761be2bf29fe69121668b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92d7e016b5037dd9e721b34d1cfab404.png)
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3 . 化简下面各比。
0.28∶0.04 10分∶0.5时
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf110ecaa8a1c3ad27ad39d2b0c6521.png)
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4 . 直接写得数。
时
分![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8494aa2a53dcf7d38b9b0617af32244a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ec9f457827a5b7fc37c914ae1fb581.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31f158cce75553a5ac406efce861c5bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d629177f3e9cf3c0d54dcc11b377a636.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b7fda59480e610b5454ef47772fb054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f655a405a3440f9e477113ca9e5dc30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70bf2eef0d5b0b97d1cd776b6534b598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ef63ad7b61f3fae0ac81148e7700ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa59d2be00f49bd59e6abd97d2fc4e4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b61d81213ed196657a851590b991b63.png)
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5 . 化简比。
(1)2.5∶
(2)1.2时∶30分
(1)2.5∶
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
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6 . 化简下列各比。
0.6∶0.2
∶2.4 1.2时∶45分
0.6∶0.2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d41840af35e218a5639a2eff4d80b54.png)
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7 . 化简比,写出过程。
12∶40 1.5时∶45分
12∶40 1.5时∶45分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68db204ae2d0e4d32249fd6fdb99f4.png)
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8 . 口算下面各题。
18×5= 36×11= 906÷3= 9×9-8=
84÷4= 32×78≈ 1时-20分= 10+3×20=
18×5= 36×11= 906÷3= 9×9-8=
84÷4= 32×78≈ 1时-20分= 10+3×20=
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9 . 化简比。
3.6∶6
时∶20分
3.6∶6
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52ead99bb04aff0af690845632fb6d23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
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10 . 化简比。
14∶49
∶8 48分∶1.2时
14∶49
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d86ab7c97cd8a0b15ba5efc1be94230.png)
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