1. Tính a, 1/3 . -6/13 . -9/10 . -13/36 b, 3/7 . 9/26 – 1/14 . 1/13 -1/7 22/08/2021 Bởi Vivian 1. Tính a, 1/3 . -6/13 . -9/10 . -13/36 b, 3/7 . 9/26 – 1/14 . 1/13 -1/7
Đáp án: \(a,\ \dfrac{1}{3}.\dfrac{-6}{13}.\dfrac{-9}{10}.\dfrac{-13}{36}=\dfrac{-1}{20}\\ b,\ \dfrac{3}{7}.\dfrac{9}{26}-\dfrac{1}{14}.\dfrac{1}{13}-\dfrac{1}{7}=0\) Giải thích các bước giải: \(a,\ \dfrac{1}{3}.\dfrac{-6}{13}.\dfrac{-9}{10}.\dfrac{-13}{36}\\ =\bigg(\dfrac{1}{3}.\dfrac{-9}{10}\bigg).\bigg(\dfrac{-6}{13}.\dfrac{-13}{36}\bigg)\\ =\dfrac{-3}{10}.\dfrac{1}{6}\\ =\dfrac{-1}{20}\\ b,\ \dfrac{3}{7}.\dfrac{9}{26}-\dfrac{1}{14}.\dfrac{1}{13}-\dfrac{1}{7}\\ =\dfrac{27}{182}-\dfrac{1}{182}-\dfrac{1}{7}\\ =\bigg(\dfrac{27}{182}-\dfrac{1}{182}\bigg)-\dfrac{1}{7}\\ =\dfrac{1}{7}-\dfrac{1}{7}=0\) chúc em học tốt! Bình luận
Đáp án: Giải thích các bước giải: a)1/3 .-6/13 .-9/10 .-13/36 =1.-6.-9.-13/3.13.10.36 =-1/20 b)3/7 . 9/26 -1/14 . 1/13 . -1/7 =3.9/7.26+( -1 .1/13.14) -1/7 =27/182 -1/182 -16/182 =27/182 -27/182 =0 Bình luận
Đáp án:
\(a,\ \dfrac{1}{3}.\dfrac{-6}{13}.\dfrac{-9}{10}.\dfrac{-13}{36}=\dfrac{-1}{20}\\ b,\ \dfrac{3}{7}.\dfrac{9}{26}-\dfrac{1}{14}.\dfrac{1}{13}-\dfrac{1}{7}=0\)
Giải thích các bước giải:
\(a,\ \dfrac{1}{3}.\dfrac{-6}{13}.\dfrac{-9}{10}.\dfrac{-13}{36}\\ =\bigg(\dfrac{1}{3}.\dfrac{-9}{10}\bigg).\bigg(\dfrac{-6}{13}.\dfrac{-13}{36}\bigg)\\ =\dfrac{-3}{10}.\dfrac{1}{6}\\ =\dfrac{-1}{20}\\ b,\ \dfrac{3}{7}.\dfrac{9}{26}-\dfrac{1}{14}.\dfrac{1}{13}-\dfrac{1}{7}\\ =\dfrac{27}{182}-\dfrac{1}{182}-\dfrac{1}{7}\\ =\bigg(\dfrac{27}{182}-\dfrac{1}{182}\bigg)-\dfrac{1}{7}\\ =\dfrac{1}{7}-\dfrac{1}{7}=0\)
chúc em học tốt!
Đáp án:
Giải thích các bước giải:
a)1/3 .-6/13 .-9/10 .-13/36
=1.-6.-9.-13/3.13.10.36
=-1/20
b)3/7 . 9/26 -1/14 . 1/13 . -1/7
=3.9/7.26+( -1 .1/13.14) -1/7
=27/182 -1/182 -16/182
=27/182 -27/182
=0