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七上第三次段考複習卷19

Authored by 黃俊賓 關山國中

Mathematics

7th Grade

Used 4+ times

七上第三次段考複習卷19
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35 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

[(25)3]2×(52)6\left[(\frac{2}{5})^3\right]^2\times(\frac{5}{2})^6 的值為下列何者?

−2

0

1

2

2.

MULTIPLE SELECT QUESTION

30 sec • 1 pt

化簡 12÷(-32)3×(-9)+(-22)12\div(\frac{-3}{2})^3\times(-9)+(-2^2) 之後,可得下列哪一個結果?

36

28

−36

−28

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

下列四個敘述中,哪一個是正確的?

2x 表示 2 + x

x2x^2 表示 x + x

2x2 表示 (2x)×(2x)\left(2x\right)\times\left(2x\right)

2x + 5 表示 x+x + 5

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

某商品定價為 x 元時,可獲利成本的 20%;若此商品訂一新價格再打九折後,可獲利成本的 17%。則新價格應訂為多少?

13x12\frac{13x}{12}

17x12\frac{17x}{12}

17x10\frac{17x}{10}

1.17x1.17x

Answer explanation

定價-成本=獲利

x-成本=0.2成本

x=1.2成本=(12/10)成本

成本=10x/12

0.9新定價-(10x/12)=(10x/12)*(17/100)

0.9新定價-(10x/12)=(17x/120)

0.9新定價=(17x/120)+(10x/12)

0.9新定價=(17x/120)+(100x/120)

0.9新定價=(117x/120)

新定價=(117x/120)*(10/9)

新定價= 13x12\frac{13x}{12}

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

比較下列各式的大小: (89)3           (89)2(\frac{8}{9})^3\ \ _{\ \ \ \ \ \ \ \ \ }(\frac{8}{9})^2

<

>

=

Answer explanation

小於1的真分數或小數------次方數愈大,值愈小。

0.1x0.1=0.01

0.1x0.1x0.1=0.001

0.12>0.130.1^2>0.1^3

相反的,大於1的真分數或小數------次方數愈大,值愈大

6.

MULTIPLE SELECT QUESTION

45 sec • 1 pt

計算下列各式的結果是什麼? (1) (30+32)×(24+2)(3^0+3^2)\times(2^4+2) (2) 9÷(−13)4+(−2)39\div(−\frac{1}{3})^4+(−2)^3

90

180

−64781-\frac{647}{81}

721

Answer explanation

(1)=(1+9)x(16+2)=180

(2)= 9÷(181)+(−8)=9×81−8=729−8=7219\div\left(\frac{1}{81}\right)+\left(-8\right)=9\times81-8=729-8=721

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

比較 (−913)3\left(\frac{−9}{13}\right)^3 、 (−913)2\left(\frac{-9}{13}\right)^2 何者較大?

(−913)3\left(\frac{−9}{13}\right)^3

(−913)2\left(\frac{-9}{13}\right)^2

Answer explanation

偶數次方為正數,奇數次方為負數

所以正數>負數

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