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a.9/20-8/15x5/12
=9/20-2/9
=41/180
b.2/3:4/5:7/12
=5/6:7/12
=10/7
c.4/9+11/8-5/6
=131/72-5/6
=71/72
tk mk nhé bạn
a 7/15 + (5/6 - 1/3) = 7/15 + 1/2 = 14/30 + 15/30 = 29/30
b 4/7 *21/16 : 5/8 = 3/4 : 5/8 = 6/5
c 15/8 - 4/9 * 6/8+ 1/6 =15/8 - 1/3 + 1/6 = 37/24 + 1/6 = 41/24
d 5/12+(3/4 + 2/3 ) : 34/3 =
a/\(\frac{7}{15}+\left(\frac{5}{6}-\frac{1}{3}\right)=\frac{7}{15}+\frac{1}{2}=\frac{29}{30}\)
b/\(\frac{4}{7}\cdot\frac{21}{16}:\frac{5}{8}=\frac{4}{7}\cdot\frac{2}{16}\cdot\frac{8}{5}=\frac{4}{35}\)
c/\(\frac{15}{8}-\frac{4}{9}\cdot\frac{6}{8}+\frac{1}{6}=\frac{15}{8}-\frac{1}{3}+\frac{1}{6}=\frac{41}{24}\)
d/ \(\frac{5}{12}+\left(\frac{3}{4}+\frac{2}{3}\right):\frac{34}{3}=\frac{5}{12}+\frac{17}{12}:\frac{34}{3}=\frac{5}{12}+\frac{1}{8}=\frac{13}{24}\)
A = (2 + 22) + (23 + 24 ) +…(2199 + 2200)
A = 6 + 22 (2 + 22 ) +… + 2198 (2 + 22)
A = 6 + 22 (6 ) +… + 2198 (6)
A = 6(1 + 22 +… + 2198)
Vậy A chia hết cho 6
a) \(\left(\frac{2}{7}+\frac{3}{8}+\frac{12}{7}+\frac{5}{8}\right).\frac{19}{36}\)
\(=\left\{\left(\frac{2}{7}+\frac{12}{7}\right)+\left(\frac{3}{8}+\frac{5}{8}\right)\right\}.\frac{19}{36}\)
\(=\left(\frac{14}{7}+\frac{8}{8}\right).\frac{19}{36}\)
\(=\left(2+1\right).\frac{19}{36}\)
\(3.\frac{19}{36}=\frac{19}{12}\)
\(\frac{50}{150}=\frac{1}{3}\)
\(\frac{5}{20}=\frac{1}{4}\)
\(\frac{8}{32}=\frac{1}{4}\)
Sau đó bạn cứ rút gọn thôi,tích cho tớ nha
- \(\frac{1}{3}\)
- \(\frac{1}{4}\)
- \(\frac{1}{4}\)
- \(\frac{2}{3}\)
- \(\frac{2}{3}\)
- \(\frac{3}{2}\)
- \(\frac{3}{5}\)
- \(\frac{1}{2}\)
- \(\frac{18}{5}\)
- \(\frac{1}{4}\)
- \(\frac{1}{25}\)
- \(\frac{1}{8}\)
- \(\frac{1}{2}\)
- \(\frac{3}{7}\)
- \(\frac{2}{3}\)
- \(\frac{1}{3}\)
- k cho mk nha
Lời giải:
$\frac{4}{5}-\frac{7}{8}=\frac{4\times 8-7\times 5}{5\times 8}=\frac{-3}{40}$ (bạn xem lại đề, lớp 4 chưa học số âm)
$\frac{9}{15}+\frac{50}{12}=\frac{3}{5}+\frac{25}{6}=\frac{3\times 6+25\times 5}{5\times 6}=\frac{143}{30}$
$\frac{89}{4}\times \frac{7}{78}=\frac{623}{312}$
$\frac{8}{9}: \frac{2}{12}=\frac{8}{9}:\frac{1}{6}=\frac{8}{9}\times 6=\frac{16}{3}$