Câu hỏi của Trần Ngọc Linh Giang

Question

Thực hiện phép tínha)2/9+1/3:(-3/2)+1/2x(-0,5)b)16/21x3/7+16/11x4/7+-5/11giúp mình với ạ

Van Toan · Accepted Answer

$a,\dfrac{2}{9}+\dfrac{1}{3}:\left(-\dfrac{3}{2}\right)+\dfrac{1}{2}\times\left(-0,5\right)\
=\dfrac{2}{9}+\dfrac{1}{3}\times\left(-\dfrac{2}{3}\right)+\dfrac{1}{2}\times\dfrac{-1}{2}\
=\dfrac{2}{9}+\dfrac{-2}{9}+\dfrac{-1}{4}\
=0+\dfrac{-1}{4}\
=\dfrac{-1}{4}$$b,\dfrac{16}{21}\times\dfrac{3}{7}+\dfrac{16}{11}\times\dfrac{4}{7}+\dfrac{-5}{11}\
=\dfrac{16}{49}+\dfrac{64}{77}+\dfrac{-5}{11}\
=\dfrac{624}{539}+\dfrac{-5}{11}\
=\dfrac{379}{539}$Câu trả lời: $a,\dfrac{2}{9}+\dfrac{1}{3}:\left(-\dfrac{3}{2}\right)+\dfrac{1}{2}\times\left(-0,5\right)\
=\dfrac{2}{9}+\dfrac{1}{3}\times\left(-\dfrac{2}{3}\right)+\dfrac{1}{2}\times\dfrac{-1}{2}\
=\dfrac{2}{9}+\dfrac{-2}{9}+\dfrac{-1}{4}\
=0+\dfrac{-1}{4}\
=\dfrac{-1}{4}$$b,\dfrac{16}{21}\times\dfrac{3}{7}+\dfrac{16}{11}\times\dfrac{4}{7}+\dfrac{-5}{11}\
=\dfrac{16}{49}+\dfrac{64}{77}+\dfrac{-5}{11}\
=\dfrac{624}{539}+\dfrac{-5}{11}\
=\dfrac{379}{539}$

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