5/6 nhân 4/5 nhân 3/2 =?
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Viết phân số thích hợp vào chỗ chấm:
A) 3/4 nhân ( 5/6+6/5 )= 3/4 nhân 5/6+3/4 nhân 6/5
B) 7/5 nhân ( 4/7-2/5 )= 7/5 nhân 4/7- 7/5 nhân 2/5
a) \(\frac{75^3.3^7}{81^4.5^6}=\frac{5^3.3^3.5^3.3^7}{\left(3^4\right)^4.5^6}=\frac{5^6.3^3.3^7}{3^{16}.5^6}=\frac{3^{10}}{3^{16}}=\frac{1}{3^6}=\frac{1}{729}\)
b) \(\frac{6^6.4^2}{3^{12}.2^8}=\frac{2^6.3^6.\left(2^2\right)^2}{3^{12}.2^8}=\frac{2^6.3^6.2^4}{3^{12}.2^8}=\frac{2^{10}.3^6}{3^{12}.2^8}=\frac{2^2.1}{3^6}=\frac{4}{729}\)
c) \(\frac{34^5.2^5}{2^{14}.17^5}=\frac{2^5.17^5.2^5}{2^{14}.17^5}=\frac{2^{10}}{2^{14}}=\frac{1}{2^4}=\frac{1}{16}\)
\(\dfrac{4^{^5}.9^{^4}-2.6^{^9}}{2^{^{10}}.3^{^8}+6^{^8}.20}\)=\(\dfrac{2^{^{10}}.3^{^8}-2.2^{^9}.3^{^9}}{2^{^{10}}.3^{^8}+2^{^8}.3^{^8}.2^{^2}.5}\)=\(\dfrac{2^{^{10}}.3^{^8}-2^{^{10}}.3^{^9}}{2^{^{10}}.3^{^8}+2^{^{10}}.3^{^8}.5}\)=\(\dfrac{2^{^{10}}.3^{^8}\left(1-3\right)}{2^{^{10}}.3^{^8}\left(1+5\right)}\)=\(\dfrac{1-3}{1+5}\)=\(\dfrac{1}{3}\)
45.94−2.69210.38+68.2045.94−2.69210.38+68.20=210.38−2.29.39210.38+28.38.22.5210.38−2.29.39210.38+28.38.22.5=210.38−210.39210.38+210.38.5210.38−210.39210.38+210.38.5=210.38(1−3)210.38(1+5)210.38(1−3)210.38(1+5)=1−31+51−31+5=13
\(4^2\cdot120-4^3\cdot17+4^2\cdot34\)
\(=4^2\left(120-4\cdot17+34\right)\)
\(=16\left(120-68+34\right)\)
\(=16\cdot86=1088\)
\(\frac{1}{1}\)x 2 x 3 + \(\frac{1}{2}\)x 3 x 4 + \(\frac{1}{3}\)x 4 x 5 + \(\frac{1}{4}\)x 5 x 6
= 1 x 2 + \(\frac{1}{2}\)+ \(\frac{1}{3}\)+ \(\frac{1}{4}\)x 6
= 2 +\(\frac{1}{2}\)+ \(\frac{1}{3}\)+ 1, 5
=
Bn làm nhân chia trước cộng trừ sau nhé.
áp dụng công thức bn nhé
chúc bn hộc tốt
\(\dfrac{5}{6}\) \(\times\) \(\dfrac{4}{5}\) \(\times\) \(\dfrac{3}{2}\)
\(=\) \(\dfrac{20}{30}\) \(\times\) \(\dfrac{3}{2}\)
\(=\) \(\dfrac{60}{60}\) \(=\) \(1\)
\(Cho\) \(1\) \(like\) \(nha\)
\(\dfrac{5}{6}\times\dfrac{4}{5}\times\dfrac{3}{2}=\dfrac{5\times4\times3}{6\times5\times2}=\dfrac{4\times3}{6\times2}=\dfrac{2}{2}=1\)