-2/7+1/5:7/15 6/7+5/7:5-8/9 1/4+3/4.(-1/2+2/3) 22/11/2021 Bởi Kennedy -2/7+1/5:7/15 6/7+5/7:5-8/9 1/4+3/4.(-1/2+2/3)
$\dfrac{-2}{7}+\dfrac{1}{5}:\dfrac{7}{15}$ $=\dfrac{-2}{7}+\dfrac{1}{5}\cdot\dfrac{15}{7}$ $=\dfrac{-2}{7}+\dfrac{3}{7}$ $=\dfrac{1}{7}$ $\dfrac{6}{7}+\dfrac{5}{7}:5-\dfrac{8}{9}$ $=\dfrac{6}{7}+\dfrac{5}{7}\cdot\dfrac{1}{5}-\dfrac{8}{9}$ $=\dfrac{6}{7}+\dfrac{1}{7}-\dfrac{8}{9}$ $=\dfrac{7}{7}-\dfrac{8}{9}$ $=1-\dfrac{8}{9}$ $=\dfrac{1}{9}$ $\dfrac{1}{4}+\dfrac{3}{4}(\dfrac{-1}{2}+\dfrac{2}{3})$ $=\dfrac{1}{4}+\dfrac{3}{4}\cdot\dfrac{1}{6}$ $=\dfrac{1}{4}+\dfrac{1}{8}$ $=\dfrac{3}{8}$ Bình luận
Đáp án: BẠN THAM KHẢO Ạ!! Giải thích các bước giải: -2/7+1/5:7/15 =-2/7+3/7 =1/7 6/7+5/7:5-8/9 =6/7+1/7-8/9 =1-8/9 =1/9 1/4+3/3×(-1/2+2/3) =1/4+1/6 =5/12 CHÚC BẠN HỌC TỐT^>^ Bình luận
$\dfrac{-2}{7}+\dfrac{1}{5}:\dfrac{7}{15}$
$=\dfrac{-2}{7}+\dfrac{1}{5}\cdot\dfrac{15}{7}$
$=\dfrac{-2}{7}+\dfrac{3}{7}$
$=\dfrac{1}{7}$
$\dfrac{6}{7}+\dfrac{5}{7}:5-\dfrac{8}{9}$
$=\dfrac{6}{7}+\dfrac{5}{7}\cdot\dfrac{1}{5}-\dfrac{8}{9}$
$=\dfrac{6}{7}+\dfrac{1}{7}-\dfrac{8}{9}$
$=\dfrac{7}{7}-\dfrac{8}{9}$
$=1-\dfrac{8}{9}$
$=\dfrac{1}{9}$
$\dfrac{1}{4}+\dfrac{3}{4}(\dfrac{-1}{2}+\dfrac{2}{3})$
$=\dfrac{1}{4}+\dfrac{3}{4}\cdot\dfrac{1}{6}$
$=\dfrac{1}{4}+\dfrac{1}{8}$
$=\dfrac{3}{8}$
Đáp án:
BẠN THAM KHẢO Ạ!!
Giải thích các bước giải:
-2/7+1/5:7/15
=-2/7+3/7
=1/7
6/7+5/7:5-8/9
=6/7+1/7-8/9
=1-8/9
=1/9
1/4+3/3×(-1/2+2/3)
=1/4+1/6
=5/12
CHÚC BẠN HỌC TỐT^>^