tinh bang cach thuan tien nhat
19/11 + [8/13 + 3/11] =................
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\(\frac{4}{15}+\frac{8}{13}+\frac{11}{15}+\frac{5}{13}\)
\(=\left(\frac{4}{15}+\frac{11}{15}\right)+\left(\frac{8}{13}+\frac{5}{13}\right)\)
\(=\frac{15}{15}+\frac{13}{13}\)
\(=1+1\)
\(=2\)
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\(\frac{4}{15}+\frac{8}{13}+\frac{11}{15}+\frac{5}{13}\)
\(=\left(\frac{4}{15}+\frac{11}{15}\right)+\left(\frac{8}{13}+\frac{5}{13}\right)\)
\(=1+1\)
\(=2\)
2x25x50xx8=(25x8)x(50x2)=200x100=20000
12x11+21x11+11x33=11x(12+21+33)=11x66=726
2*25*50*8
=(2*50)*(25*8)
=100*200=20000
12*11+21*11+11*33
=11*(12+21+33)
=11*66=676
20, 11×96+20, 11:0, 25
= 20,11 x 96 + 20,11 x 4
= 20,11 x ( 96 + 4 )
= 20,11 x 100
= 2011
( 23 + 47) + (11 + 49) = 50 + 50 = 100
(4. 25) . (7 . 11) = 100 . 77 = 7700
23+47+11+49
=(23+47)+(11+49)
= 70 + 60
= 130
4.7.11.25
=(4.25).(7.11)
= 100 . 77
= 7700
5.9.3.2
=(5.2).(3.9)
= 10. 27
= 270
23+47+11+49 = 70 + 60 = 130
4.7.11.25 = 4 . 25 . 7 . 11 = 100 x 77 = 7700
5.9.3.2 = 5 x 2 x 3 x 2 = 10 x 6 = 60
\(\frac{7}{11}+\frac{3}{4}+\frac{4}{11}+\frac{1}{4}=\left(\frac{7}{11}+\frac{4}{11}\right)+\left(\frac{3}{4}+\frac{1}{4}\right)=1+1=2\)
\(\frac{7}{11}\)+ \(\frac{3}{4}\) + \(\frac{4}{11}\) + \(\frac{1}{4}\)
= \(\left(\frac{7}{11}+\frac{4}{11}\right)\)+ \(\left(\frac{3}{4}+\frac{1}{4}\right)\)
= 1 + 1
= 2
\(\frac{72}{99}\)- \(\frac{28}{99}\) - \(\frac{14}{99}\)
= \(\frac{72}{99}\) - \(\left(\frac{28}{99}+\frac{14}{99}\right)\)
= \(\frac{72}{99}\) - \(\frac{42}{99}\)
= \(\frac{30}{99}\)
19/11 + [8/13 + 3/11]
=19/11+ 3/11+ 8/13
= 2 + 8/13
= 34/13
=\(\frac{19}{11}+\frac{3}{11}+\frac{8}{13}\)
=\(2+\frac{8}{13}\)
=\(2\frac{8}{13}\)