tính nhanh 3/5 . 13/46 - 1/10 . 16/23
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\(\frac{3}{5}.\frac{13}{46}-\frac{1}{10}.\frac{16}{23}=\frac{3.13}{5.46}-\frac{1.16}{10.23}\)
\(=\frac{39}{230}-\frac{8}{115}=\frac{39}{230}-\frac{8.2}{115.2}\)
\(=\frac{39}{230}-\frac{16}{230}=\frac{39-16}{230}\)
\(=\frac{23}{230}=\frac{1}{10}\)
\(\frac{3}{5}.\frac{13}{46}-\frac{1}{10}.\frac{16}{23}\)
= \(\frac{39}{230}-\frac{8}{115}\)
= \(\frac{1}{10}\)
\(\frac{3}{5}.\frac{13}{46}+\frac{1}{10}.\frac{16}{23}=\frac{39}{230}+\frac{1}{10}.\frac{16}{23}=\frac{39}{230}+\frac{8}{115}=\frac{11}{46} \)
học tốt
Tính
3 .1/5.1/2.13/23 + 1/0.16/23
3.1/10.13/23 + 1/10 . 16/23
1/10 . {3.13/23 + 16/23}
toi day ban tu tinh
\(\frac{3}{5}.\frac{13}{46}-\frac{1}{10}.\frac{16}{23}\)
\(=\frac{3}{5}.\left(\frac{1}{46}.13\right)-\frac{1}{10}.\frac{32}{46}\)
\(=\left(\frac{3}{5}.13\right).\frac{1}{46}-\left(\frac{1}{10}.32\right).\frac{1}{46}\)
\(=\frac{39}{5}.\frac{1}{46}-\frac{32}{10}.\frac{1}{46}\)
\(=\frac{78}{10}.\frac{1}{46}-\frac{32}{10}.\frac{1}{46}\)
\(=\left(\frac{78}{10}-\frac{32}{10}\right).\frac{1}{46}\)
\(=\frac{46}{10}.\frac{1}{46}\)
\(=\frac{1}{10}\)
\(\text{Phần a nên sửa đề thế này :}\) \(\frac{1}{7}.\frac{-3}{8}+\frac{1}{7}.\frac{-13}{8}\)
\(\text{Giải :}\)
\(\frac{1}{7}.\frac{-3}{8}+\frac{1}{7}.\frac{-13}{8}\)
\(=\frac{1}{7}\left(\frac{-3}{8}+\frac{-13}{8}\right)\)
\(=\frac{1}{7}.\left(-2\right)\)
\(=\frac{-2}{7}\)
\(\frac{3}{5}.\frac{13}{46}-\frac{1}{10}.\frac{16}{23}\)
\(=\frac{3}{5}.\left(\frac{1}{46}.13\right)-\frac{1}{10}.\frac{32}{46}\)
\(=\left(\frac{3}{5}.13\right).\frac{1}{46}-\left(\frac{1}{10}.32\right).\frac{1}{46}\)
\(=\frac{39}{5}.\frac{1}{46}-\frac{32}{10}.\frac{1}{46}\)
\(=\frac{78}{10}.\frac{1}{46}-\frac{32}{10}.\frac{1}{46}\)
\(=\left(\frac{78}{10}-\frac{32}{10}\right).\frac{1}{46}\)
\(=\frac{46}{10}.\frac{1}{46}\)
\(=\frac{1}{10}\)
a) \(\frac{3}{5}\cdot\frac{13}{46}-\frac{1}{10}\cdot\frac{16}{23}=\frac{39-16}{10\cdot23}=\frac{1}{10}\)
b) \(\frac{3}{7}\cdot\frac{9}{26}-\frac{1}{14}\cdot\frac{1}{13}=\frac{27-1}{14\cdot13}=\frac{2\cdot13}{2\cdot7\cdot13}=\frac{1}{7}\)
a. ( 23 - 21) + ( 19 - 17) + ( 15 - 13) + ( 11 - 9) + ( 7 - 5) + ( 3 - 1)
= 2 + 2 + 2 + 2 + 2 + 2
= 2 x 6
= 12
b. ( 24 - 22 ) + ( 20 - 18 ) + ( 16 - 14 ) + ( 12 - 10) + ( 8 - 6 ) + ( 4 - 2)
= 2 + 2 + 2 + 2 + 2 + 2
= 2 x 6
= 12
\(\dfrac{3}{5}.\dfrac{13}{46}-\dfrac{1}{10}.\dfrac{16}{23}\)
\(=3.\dfrac{1}{5}.\dfrac{1}{2}.\dfrac{13}{23}-\dfrac{1}{10}.\dfrac{16}{23}\)
\(=3.\dfrac{1}{10}.\dfrac{13}{23}-\dfrac{1}{10}.\dfrac{16}{23}\)
\(=\dfrac{1}{10}.\left(3.\dfrac{13}{23}-\dfrac{16}{23}\right)\)
\(=\dfrac{1}{10}.1=\dfrac{1}{10}\)
Chúc bạn học tốt!!!
3/5 . 13/46 - 1/10 . 16/23 = 3 . 1/5 . 1/2 . 13/23 - 1/10 . 16/23
= 1/10 . 39/23 - 1/10 . 16/23
= 1/10 . (39/23 - 16/23)
= 1/10
Xong rồi đó ^ ^!