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\(25\times4\times46+25\times54\times4\)
\(\Rightarrow25\times4\times\left(46+54\right)\)
\(\Rightarrow100\times100\)
\(\Rightarrow10000\)
25 × 4 × 46 + 25 × 54 × 4
=25 × 4 × ( 46 + 54 )
=100 × 100
=10000
a) \(\dfrac{2}{9}+\dfrac{5}{9}=\dfrac{7}{9};\dfrac{5}{9}+\dfrac{2}{9}=\dfrac{7}{9}\)
Vậy: \(\dfrac{2}{9}+\dfrac{5}{9}=\dfrac{5}{9}+\dfrac{2}{9}\)
b) \(\dfrac{3}{25}+\dfrac{4}{25}+\dfrac{7}{25}=\dfrac{14}{25};\dfrac{3}{25}+\dfrac{7}{25}+\dfrac{4}{25}=\dfrac{14}{25}\)
Vậy: \(\dfrac{3}{25}+\dfrac{4}{25}+\dfrac{7}{25}=\dfrac{3}{25}+\dfrac{7}{25}+\dfrac{4}{25}\)
a, 75 x 75 + 75 x 24 + 75
= 75 x ( 75 + 24 + 1 )
= 75 x 100
= 7500
b, 25 × 25 + 25 × 25 + 25 × 25 + 25 × 24 + 25
= 25 x ( 25 + 25 + 25 + 24 + 1 )
= 25 x 100
= 2500
c, 125 x 4 x 25 x 8
= ( 125 x 8 ) x ( 4 x 25 )
= 1000 x 100
= 100000
a) = 75 x (75+24+1)
=75 x 100
=7500
b) =25 x (25+25+25+24+25)
= 25 x 124
= 3100
c) = (125 x 8) x (25 x 4)
=1000 x 100
=100000
`a: =(7/3-4/3)+11/5=16/5`
`b: =(18/13-5/13)+55/46=1+55/46=101/46`
`c: =27/25-4/9-2/25+5/9=(27/25-2/25)+(5/9-4/9)=1+1/9=10/9`
48 ; 4 x 25 : 25
=(48 : 4) x (25 : 25)
=12 x 1
=12
chúc bạn hộc tốt
25 + 25 + 25 + 25 + 25 + 25 +25 + 25=25x8=200
45 + 45 + 45 + 45 + 15 + 15 + 15 + 15=(45x4)+(15x4)=180+60=240
\(1,\dfrac{12}{25}+\dfrac{3}{5}+\dfrac{13}{25}=\left(\dfrac{12}{25}+\dfrac{13}{25}\right)+\dfrac{3}{5}=1+\dfrac{3}{5}=\dfrac{8}{5}\\ 2,\dfrac{3}{2}+\dfrac{2}{3}+\dfrac{4}{3}=\dfrac{3}{2}+\left(\dfrac{2}{3}+\dfrac{4}{3}\right)=\dfrac{3}{2}+2=\dfrac{7}{2}\\ 3,\dfrac{3}{2}+\dfrac{7}{5}+\dfrac{3}{4}=\left(\dfrac{3}{2}+\dfrac{3}{4}\right)+\dfrac{7}{5}=\left(\dfrac{6}{4}+\dfrac{3}{4}\right)+\dfrac{7}{5}=\dfrac{9}{4}+\dfrac{7}{5}=\dfrac{45}{20}+\dfrac{28}{20}=\dfrac{73}{20}\)
a) \(125\times25\times8\times4\)
\(\Rightarrow\left(125\times8\right)\times\left(25\times4\right)\)
\(\Rightarrow1000\times100\)
\(\Rightarrow100000\)
4900 : 25 : 4
= 4900 : (25 x 4)
= 4900 : 100
= 49
235 x 2 + 235 x 3 + 235 x 5
= 235 x (2+3+5)
= 235 x 10
= 23500
4900 : 25 : 4 = 49
235 x 2 + 235 x 3 + 235 x 5 = 2350