tính nhanh:
a) 32x50/48x75=
b) 63x81/135x84
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\(\dfrac{63\times81}{135\times84}\text{=}\dfrac{3\times3\times7\times3\times3\times3\times3}{3\times3\times3\times5\times2\times2\times3\times7}\text{=}\dfrac{9}{20}\)
63x81/135x84=3x3x7x3x3x3x3/3x3x3x5x22x2x7=9/20
1111x5/1515x7=101x11x5/101x3x5x7=11/21
Hoặc 1111x5/1515x7=1111x5/303x5x7=1111/303x7=1111/2121=1111:101/2121:101=11/21
a: \(=\dfrac{32}{48}\cdot\dfrac{50}{75}=\dfrac{2}{3}\cdot\dfrac{2}{3}=\dfrac{4}{9}\)
b: \(=\dfrac{7\cdot9\cdot81}{27\cdot5\cdot84}=\dfrac{9\cdot81}{27\cdot3}\cdot\dfrac{7}{5\cdot28}=9\cdot\dfrac{1}{4\cdot5}=\dfrac{9}{20}\)
\(a,\dfrac{8\times4\times50}{48\times75}=\dfrac{2\times2\times2\times2\times2\times25}{2\times2\times2\times2\times3\times25\times3}=\dfrac{2\times2}{3\times3}=\dfrac{4}{9}\)
\(b,\dfrac{7\times9\times81}{9\times3\times5\times84}=\dfrac{7\times9\times9\times3\times3}{9\times3\times5\times7\times3\times4}=\dfrac{9}{5\times4}=\dfrac{9}{20}\)
a: 1792, 3600
b:5103
c:11340
em nhé
~chúc em học tốt ~ <3
a) \(52^2\)
\(=\left(50+2\right)^2\)
\(=50^2+2\cdot2\cdot50+2^2\)
\(=2500+200+4\)
\(=2704\)
b) \(98^2\)
\(=\left(100-2\right)^2\)
\(=100^2-2\cdot100\cdot2+2^2\)
\(=10000-400+4\)
\(=9604\)
`a, 52^2 = (50+2)^2 = 2500 + 200 + 4 = 2704`
`b, 98^2 = (100-2)^2 = 100^2 - 2 . 100 . 2 + 4 = 10000 - 400 + 4`
`= 9604`
\(a,9\times435\times4+12\times565\times3\)
\(=36\times435+36\times565\)
\(=36\times\left(435+565\right)\)
\(=36\times1000\)
\(=36000\)
\(b,4\times1368\times21-7\times368\times12\)
\(=84\times1368-84\times368\)
\(=84\times\left(1368-368\right)\)
\(=84\times1000\)
\(=84000\)
TL
a)9×435×4+12×565×3
=36×435+36×565=36×435+36×565
=36×(435+565)=36×(435+565)
=36×1000=36×1000
=36000=36000
�,4×1368×21−7×368×12b)4×1368×21−7×368×12
=84×1368−84×368=84×1368−84×368
=84×(1368−368)=84×(1368−368)
=84×1000=84×1000
=84000=84000
HT
a)\(\frac{32x50}{48x75}=\frac{2x2}{3x3}=\frac{4}{9}\)
còn b)