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十字交乘

十字交乘

Assessment

Interactive Video

Mathematics

3rd Grade

Easy

Created by

林育竹 林育竹

Used 1+ times

FREE Resource

4 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

十字交乘法(平方係數為1)的第一步是什麼?

先看一次項的正負

先看常數項

先看平方項的係數

先分解x項

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

在十字交乘法中,如果常數項為正數(同號),接下來應該看什麼?

相加

相減

相乘

相除

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

使用十字交乘法分解因式時,最後一步需要檢查什麼?

常數項的正負

平方項的係數

一次項的正負

分解後的乘積

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

將 x² - x - 42 因式分解,結果為何?

(x + 6)(x + 7)

(x - 6)(x - 7)

(x + 6)(x - 7)

(x - 6)(x + 7)

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