Câu hỏi của Bùi Thu Hằng

Question

Làm giùm mk bài 11.5; 11.6; 11.6 trong SBT Toán lớp 6 tập 2 vs

Edogawa Conan · Accepted Answer

11.5:

$A=\dfrac{1.3}{2.2}.\dfrac{2.4}{3.3}.\dfrac{3.5}{4.4}.....\dfrac{29.31}{30.30}$

$A=\dfrac{1.2.3.....29}{2.3.4.....30}.\dfrac{3.4.5.....31}{2.3.4.....30}$

$A=\dfrac{1}{30}.\dfrac{31}{2}=\dfrac{31}{60}$

:Câu trả lời: 11.5:

$A=\dfrac{1.3}{2.2}.\dfrac{2.4}{3.3}.\dfrac{3.5}{4.4}.....\dfrac{29.31}{30.30}$

$A=\dfrac{1.2.3.....29}{2.3.4.....30}.\dfrac{3.4.5.....31}{2.3.4.....30}$

$A=\dfrac{1}{30}.\dfrac{31}{2}=\dfrac{31}{60}$

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Đại số lớp 6