等差級數算算算

等差級數3＋5＋7＋9＋11＋13的和為多少？

• 45

• 46

• 47

• 48

等差級數（－7）＋（－5）＋（－3）＋……＋11共10項，則此級數的和為多少？

• 20

• 19

• 18

• 17

等差級數11＋13＋15＋……前17項的和為多少？

• 453

• 455

• 457

• 459

等差級數前　10　項和　S₁₀＝50，若將各項加　5，則總和變為多少？

• 55

• 100

• 250

• 255

有一等差級數的首項為　19，末項為　135，總和為　2310，則此等差級數共有幾項？

• 10

• 20

• 30

• 40

等差數列4, 9, 14, … , 39共有8項，該數列所有項之和為

• 165

• 162

• 172

• 175

Gauss was from ____________.

• United States
• Belgium
• Germany
• France

Tags

CCSS.RI.7.3

CCSS.RI.7.5

CCSS.RI.8.3

CCSS.RI.8.5

CCSS.RI.9-10.3

Gauss' nickname was ___________.

• The King of the World
• The King of Mathematics
• The Prince of Mathematics
• The Father of Mathematics

Tags

CCSS.RI.7.3

CCSS.RI.7.5

CCSS.RI.8.3

CCSS.RI.8.5

CCSS.RI.9-10.5

Gauss was the first mathematician to create a ____-sided polygon using only a compass a straight edge.

• 15
• 17
• 19
• 21

Gauss died at the age of ____.

• 47
• 57
• 67
• 77