câu 1: đáp án bằng 49

dễ :>>>

10 + 12 + 13 + 14 = 49

\(\frac{13}{7}-\frac{8}{6}+\frac{8}{7}-\frac{4}{6}-\frac{1}{3}\)

\(=\left(\frac{13}{7}+\frac{8}{7}\right)-\left(\frac{8}{6}+\frac{4}{6}\right)-\frac{1}{3}\)

\(=3-2-\frac{1}{3}\)

\(=1-\frac{1}{3}\)

\(=\frac{2}{3}\)

Ta có \(\frac{13}{7}-\frac{8}{6}+\frac{8}{7}-\frac{4}{6}-\frac{1}{3}\)

\(=\frac{13}{7}-\frac{8}{6}+\frac{8}{7}-\frac{4}{6}-\frac{2}{6}\)

\(=\left(\frac{13}{7}+\frac{8}{7}\right)-\left(\frac{8}{6}+\frac{4}{6}+\frac{2}{6}\right)\)

\(=3-2\)

\(=1\)

\(=\frac{13}{7}-\frac{8}{6}+\frac{8}{7}-\frac{4}{6}\)

\(=\frac{13}{7}+\frac{8}{7}+\left(\frac{-8}{6}+\frac{-4}{6}\right)\)

\(=\frac{21}{7}+\frac{-12}{6}\)

\(=3+\left(-2\right)=1\)

=39x29-39x13-29x39+29x13

=-10x13=-130

=130

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Làm ơn đó

Ai làm dc mik tặng 500 robux

Nick mik tên suakf54673

= 13 mũ 1 nha

ca hai deu bang 13mu 1 nha

nho loi hua doa

Câu 9:  D

Câu10: D

Câu11: A

Câu12: C

Câu13: Không hình nào có tâm đối xứng

\(\#PeaGea\)

A =>has learned