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( 258 +852 ) x 1000 : 25
= 1110 x 1000 : 25
= 1110000 : 25
= 44400
51/60 x 12/17 : 3/10= 51/60 x 12/17 x 10/3 = 6120/3060 = 2
5/12 : 7/4 - 25/18 : 35/6 = 5/12 x 4/7 - 25/18 x 6/35 = 5/21 - 5/21 = 0
25 + 25 + 25 + 25 + 25 + 25 +25 + 25=25x8=200
45 + 45 + 45 + 45 + 15 + 15 + 15 + 15=(45x4)+(15x4)=180+60=240
a) 12 x 35 = 12 x 5 x 7 = 60 x 7 = 420
b) 25 x 24 = 25 x 4 x 6 = 100 x 6 = 600
d, X/8*32+X/3*18-X/5*10=120
X*32/8+X*18/3-X*10/5=120
32X/8+18X/3-10X/5=120
4X+6X-2X=120
8X=120
X=120/8
X=15
= 5 x 6 x 5 x 5 x 7 x 8 / 5 x 5 x 3 x 8 x 6 x 2 x 7 x 2
= 5 / 3 x 2 x 2
= 5/12
Tk mk nha
a)\(\dfrac{22}{25}+\dfrac{25}{125}+\dfrac{36}{96}\)
\(=\dfrac{22}{25}+\dfrac{1}{5}+\dfrac{3}{8}\)
\(=\dfrac{176}{200}+\dfrac{40}{200}+\dfrac{75}{200}\)
\(=\dfrac{291}{200}\)
b)\(\dfrac{22}{77}+\dfrac{56}{98}+\dfrac{25}{105}\)
\(=\dfrac{2}{7}+\dfrac{4}{7}+\dfrac{5}{21}\)
\(=\dfrac{6}{7}+\dfrac{5}{21}\)
\(=\dfrac{18}{21}+\dfrac{5}{21}=\dfrac{23}{21}\)
326:25=13,04
-1000:25=-40
119:12=9 dư 11
852:25=34,08
286:14=20 dư 6
105:25=4 dư 5
180:60=3
195:25=7 dư 20
786:30=26 dư 6