第三冊 1-1 乘法公式--10題(出處：南一)
Authored by 余金城 余金城
Mathematics
8th Grade
Used 5+ times
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10 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 5 pts
0.382＋2×0.38×0.62＋0.622＝？
0.81
1
1.21
1.44
Answer explanation
解析：
原式＝( 0.38＋0.62 )2
＝12
＝1
2.
MULTIPLE CHOICE QUESTION
2 mins • 5 pts
附圖表示下列哪一個等式？
a2＋ab＝a ( a＋b )
a2－b2＝( a＋b ) ( a－b )
a2－2ab＋b2＝( a－b )
a2＋2ab＋b2＝( a＋b )2
Answer explanation
解析：
附圖面積為a2－b2
及 ( a＋b ) ( a－b )
→ a2－b2＝( a＋b ) ( a－b )
3.
MULTIPLE CHOICE QUESTION
2 mins • 5 pts
12342－2342是幾位數？
6
7
8
9
Answer explanation
解析：
( 1234＋234 ) ( 1234－234 )
＝1468×1000
＝1468000
7位數
4.
MULTIPLE CHOICE QUESTION
2 mins • 5 pts
若 1382＝1002－100x＋382，則x＝？
38
-38
76
-76
Answer explanation
解析：
1382＝( 100＋38 )2
＝1002＋2×100×38＋382
∴－100x＝2×100×38
x＝－76
5.
MULTIPLE CHOICE QUESTION
2 mins • 5 pts
若 2004×1996＝4000000＋a，則a＝？
4
-4
16
-16
Answer explanation
解析：
左式＝( 2000＋4 ) ( 2000－4 ) ＝20002－42
＝4000000－16
＝4000000＋a
∴ a＝－16
6.
MULTIPLE CHOICE QUESTION
2 mins • 5 pts
若 ＝4899＋a，則a＝？
Answer explanation
7.
MULTIPLE CHOICE QUESTION
2 mins • 5 pts
(－90－8 )2和下列哪一個算式相等？
－902－90×8＋82
－902－2×(－8 )＋(－8 )2
(－90 )2－2×(－90 )×(－8 )＋(－8 )2
(－90 )2－2×(－90 )×8＋82
Answer explanation
解析：
(－90－8 )2
＝［(－90 )－8］2
＝(－90 )2－2×(－90 )×8＋82
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