Toán -3/15+3/10 9(-1/3 mủ 3 +1/6 .cân bật hai 4 giúp mình với ạ 08/12/2021 By Kaylee -3/15+3/10 9(-1/3 mủ 3 +1/6 .cân bật hai 4 giúp mình với ạ
Đáp án: $\begin{array}{l}a)\dfrac{{ – 3}}{{15}} + \dfrac{3}{{10}} = \dfrac{{ – 1}}{5} + \dfrac{3}{{10}}\\ = \dfrac{{ – 2}}{{10}} + \dfrac{3}{{10}} = \dfrac{{3 – 2}}{{10}} = \dfrac{1}{{10}}\\b)9.\left( { – \dfrac{1}{{{3^3}}} + \dfrac{1}{6}.\sqrt 4 } \right)\\ = 9.\left( { – \dfrac{1}{{27}} + \dfrac{1}{6}.2} \right)\\ = 9.\left( { – \dfrac{1}{{27}}} \right) + 9.\dfrac{1}{3}\\ = – \dfrac{1}{3} + 3\\ = – \dfrac{1}{3} + \dfrac{9}{3}\\ = \dfrac{8}{3}\end{array}$ Trả lời
Đáp án:
$\begin{array}{l}
a)\dfrac{{ – 3}}{{15}} + \dfrac{3}{{10}} = \dfrac{{ – 1}}{5} + \dfrac{3}{{10}}\\
= \dfrac{{ – 2}}{{10}} + \dfrac{3}{{10}} = \dfrac{{3 – 2}}{{10}} = \dfrac{1}{{10}}\\
b)9.\left( { – \dfrac{1}{{{3^3}}} + \dfrac{1}{6}.\sqrt 4 } \right)\\
= 9.\left( { – \dfrac{1}{{27}} + \dfrac{1}{6}.2} \right)\\
= 9.\left( { – \dfrac{1}{{27}}} \right) + 9.\dfrac{1}{3}\\
= – \dfrac{1}{3} + 3\\
= – \dfrac{1}{3} + \dfrac{9}{3}\\
= \dfrac{8}{3}
\end{array}$