IG2Ashley班周测-week15

Authored by 榆婷陈

Mathematics

8th Grade

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20 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

下列代数式：① $\frac{1}{a}$ ；② $\frac{3ac^2}{4}$ ；③ $\frac{5}{6+x}$ ；④ $\frac{x}{7}+\frac{y}{8}$ ；⑤ $\frac{9x+4y}{3\pi}$ ．其中分式的个数是（　　）

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

若分式 $\frac{x^2}{x-3}$ 有意义，则x的取值范围是（　　）

x＞3

x＞﹣3

x≠0

x≠3

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

分式 $\frac{\left|x\right|-2}{x-2}$ 的值为0，则x的值为（　　）

﹣2

﹣2或2

不存在这样的x

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

如果分式 $\frac{1}{1-2x}$ 的值为负数，则x的取值范围是（　　）

$x\le\frac{1}{2}$

$x<\frac{1}{2}$

$x\ge\frac{1}{2}$

$x>\frac{1}{2}$

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

某县土地面积大约为1960 $km^2$ ，我国土地面积约为960万 $km^2$ ，该县土地面积约为我国土地面积的0.000204倍，数据0.000204用科学记数法表示为（　　）

$0.204\times10^5$

$0.204\times10^{-5}$

$2.04\times10^{-4}$

$2.04\times10^4$

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

化简 $x\cdot\left(\frac{y}{x}\right)^2$ 的结果是（　　）

$\frac{y}{x}$

$\frac{y^2}{x}$

$\frac{y^2}{x^3}$

$y^2$

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

计算 $\left(-\frac{b}{a}\right)^3\cdot a^4$ 的结果是（　　）

$ab^3$

$-ab^3$

$\frac{b^7}{a}$

$-\frac{b^7}{a}$

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

化简 $\frac{x^2}{x-1}+\frac{x}{1-x}$ 的结果是（　　）

x﹣1

﹣x

x+1

MULTIPLE CHOICE QUESTION

1 min • 1 pt

化简 $\frac{4a^2}{2a-b}+\frac{b^2}{b-2a}$ 的结果是（　　）

﹣2a+b

﹣2a﹣b

2a+b

2a﹣b

10.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

下列数字与 $3^{-1}$ 相等的是（　　）

-3

$\frac{1}{3}$

$-\frac{1}{3}$

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IG2Ashley班周测-week15

下列代数式：① 1a\frac{1}{a}a1​ ；② 3ac24\frac{3ac^2}{4}43ac2​ ；③ 56+x\frac{5}{6+x}6+x5​ ；④ x7+y8\frac{x}{7}+\frac{y}{8}7x​+8y​ ；⑤ 9x+4y3π\frac{9x+4y}{3\pi}3π9x+4y​ ．其中分式的个数是（ ）

若分式 x2x−3\frac{x^2}{x-3}x−3x2​ 有意义，则x的取值范围是（ ）

分式 ∣x∣−2x−2\frac{\left|x\right|-2}{x-2}x−2∣x∣−2​ 的值为0，则x的值为（ ）

如果分式 11−2x\frac{1}{1-2x}1−2x1​ 的值为负数，则x的取值范围是（ ）

某县土地面积大约为1960 km2km^2km2 ，我国土地面积约为960万 km2km^2km2 ，该县土地面积约为我国土地面积的0.000204倍，数据0.000204用科学记数法表示为（ ）

化简 x⋅(yx)2x\cdot\left(\frac{y}{x}\right)^2x⋅(xy​)2 的结果是（ ）

计算 (−ba)3⋅a4\left(-\frac{b}{a}\right)^3\cdot a^4(−ab​)3⋅a4 的结果是（ ）

化简 x2x−1+x1−x\frac{x^2}{x-1}+\frac{x}{1-x}x−1x2​+1−xx​ 的结果是（ ）

化简 4a22a−b+b2b−2a\frac{4a^2}{2a-b}+\frac{b^2}{b-2a}2a−b4a2​+b−2ab2​ 的结果是（ ）

下列数字与 3−13^{-1}3−1 相等的是（ ）

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下列代数式：① $\frac{1}{a}$ ；② $\frac{3ac^2}{4}$ ；③ $\frac{5}{6+x}$ ；④ $\frac{x}{7}+\frac{y}{8}$ ；⑤ $\frac{9x+4y}{3\pi}$ ．其中分式的个数是（　　）

若分式 $\frac{x^2}{x-3}$ 有意义，则x的取值范围是（　　）

分式 $\frac{\left|x\right|-2}{x-2}$ 的值为0，则x的值为（　　）

如果分式 $\frac{1}{1-2x}$ 的值为负数，则x的取值范围是（　　）

某县土地面积大约为1960 $km^2$ ，我国土地面积约为960万 $km^2$ ，该县土地面积约为我国土地面积的0.000204倍，数据0.000204用科学记数法表示为（　　）

化简 $x\cdot\left(\frac{y}{x}\right)^2$ 的结果是（　　）

计算 $\left(-\frac{b}{a}\right)^3\cdot a^4$ 的结果是（　　）

化简 $\frac{x^2}{x-1}+\frac{x}{1-x}$ 的结果是（　　）

化简 $\frac{4a^2}{2a-b}+\frac{b^2}{b-2a}$ 的结果是（　　）

下列数字与 $3^{-1}$ 相等的是（　　）