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\(a)16,2.3,7+16,2.5,7-7,8.4,8-4,6.7,8\)
\(=16,2\left(3,7+5,7\right)-7,8\left(4,8-4,6\right)\)
\(=16,2.9,4-7,8.0,2\)
\(=152,28-1,56=150,72\)
\(b)11,2+12,3+13,4-12,6-11,5-10,4\)
\(=23,5+13,4-10,4-12,6-11,5\)
\(=23,5-11,5-23+13,4\)
\(=12-23+13,4=-11+13,4=2,4\)
eeeereeeeettttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttt
=\(\frac{59,94+92,34-37,44-35,88}{11,2+12,3+13,4-12,6+11,5-10,4}\)
=\(\frac{79,96}{2,4}\)
=\(\frac{1999}{60}\)
tính nhanh : 16, 2 x 3,7 +5,7 x 16,2 - 7,8 x 4,8 - 4,6 x 7,8 / 11,2 + 12,3 +13,4 - 12,6 - 11,5- 10,4
\(=\dfrac{16.2\cdot9.4-7.8\cdot9.4}{2,4}=\dfrac{8.4\cdot9,4}{2,4}=32.9\)
\(\frac{16,2.3,7+5,7.16,2-7,8.4,8-4,6.7,8}{11,2+12,3+13,4-12,6-11,5-10,4}\)
\(=\)\(\frac{16,2\left(3,7+5,7\right)-7,8\left(4,8-4,6\right)}{\left(11,2+12,3+13,4\right)-\left(12,6+11,5+10,4\right)}\)
\(=\)\(\frac{16,2.9-7,8.0,2}{36,9-34,5}\)
\(=\)\(\frac{145,8-1,56}{2,4}\)
\(=\)\(\frac{144,24}{2,4}\)
\(=\)\(60,1\)
\(\text{Học tốt!!!}\)
Đề hơi sai, t tự sửa nhé =)
\(\frac{17,8\cdot3,7-7,8\cdot4,8+5,7\cdot17,8-4,6\cdot7,8}{11,2+12,3+13,4-12,6-11,5-10,4}\)
\(=\frac{17,8\left(3,7+5,7\right)-7,8\left(4,8+4,6\right)}{\left(11,2-10,4\right)+\left(12,3-11,5\right)+\left(13,4-12,6\right)}\)
\(=\frac{17,8\cdot9,4-7,8\cdot9,4}{0,8+0,8+0,8}=\frac{9,4\left(17,8-7,8\right)}{2,4}\)
Tự tính tiếp
P/s: Hoq chắc :<
\(\frac{1}{5}+\frac{4}{10}+\frac{9}{15}+\frac{16}{20}+\frac{25}{25}+\frac{36}{30}+\frac{49}{35}+\frac{64}{40}+\frac{81}{45}\)
\(=\frac{1}{5}+\frac{2}{5}+\frac{3}{5}+\frac{4}{5}+\frac{5}{5}+\frac{6}{5}+\frac{7}{5}+\frac{8}{5}+\frac{9}{5}\)
\(=\frac{1+2+3+...+9}{5}=\frac{45}{5}=9\)