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a: =428(36+64)=42800
b: =512(47-37)=5120
c: =72x100=7200
A = \(\dfrac{27}{512}\) \(\times\) \(\dfrac{327}{213}\) \(\times\) \(\dfrac{512}{57}\) \(\times\) \(\dfrac{213}{54}\) \(\times\) \(\dfrac{57}{327}\)
A = \(\dfrac{27\times327\times512\times213\times57}{54\times327\times512\times213\times57}\)
A = \(\dfrac{27}{54}\)
A = \(\dfrac{1}{2}\)
2014 x 512 + 2015 x 488
= 2014 x 512 + ( 2014 + 1 ) x 488
= 2014 x 512 + 2014 x 488 + 488
= 2014 x ( 512 + 488 ) + 488
= 2014 x 1000 + 488
= 2 014 000 + 488
= 2 014 488
a) 512 x 20 x 5
= 512 x (20 x 5)
= 512 x 100 = 51 200
b) 125 x 32 x 8
= (125 x 8) x 32
= 1000 x 32
= 32 000
a) ( 7/11 + 5/9 ) x 2
C1 : ( 7/11 + 5/9 ) x 2
= 118/99 x 2
= 236/99
C2 : ( 7/11 + 5/9 ) x 2
= 7/11 x 2 + 5/9 x 2
= 14/11 + 10/9
= 236/99
b) ( 2/3 + 7/9 ) : 2
C1 : ( 2/3 + 7/9 ) : 2
= 13/9 : 2
= 13/18
C2 : ( 2/3 + 7/9 ) : 2
= 2/3 : 2 + 7/9 : 2
= 1/3 + 7/18
= 13/18
a) \(\left(\frac{7}{11}+\frac{5}{9}\right)\times2\)
Cách 1: \(\left(\frac{7}{11}+\frac{5}{9}\right)\times2=\frac{118}{99}\times2=\frac{236}{99}\)
Cách 2: \(\left(\frac{7}{11}+\frac{5}{9}\right)\times2=\frac{7}{11}\times2+\frac{5}{9}\times2=\frac{14}{11}+\frac{10}{9}=\frac{236}{99}\)
b) \(\left(\frac{2}{3}+\frac{7}{9}\right):2\)
Cách 1: \(\left(\frac{2}{3}+\frac{7}{9}\right):2=\frac{13}{9}:2=\frac{13}{18}\)
Cách 2: \(\left(\frac{2}{3}+\frac{7}{9}\right):2=\frac{2}{3}:2+\frac{7}{9}:2=\frac{1}{3}+\frac{7}{18}=\frac{13}{18}\)
A = 512 x 4 + 512 x 58
A = 512 x (4 + 58)
A = 512 x 62
A = 31 744
B = 312 x 36 - 312 x 26
B = 312 x (36 - 26)
B = 312 x 10
B = 3120
C = 745 x 11 - 745
C = 745 x (11 - 1)
C = 745 x 10
C = 7450
D = 837 x 15 - 837 x 5
D = 837 x (15 - 5)
D = 837 x 10
D = 8370
E = 578 x 78 - 578 x 14 + 578 x 36
E = 578 x (78 - 14 + 36)
E = 578 x 100
E = 57 800
F = 645 x 78 + 645 x 22
F = 645 x (78 + 22)
F = 645 x 100
F = 64 500
con cai nit
C1: (512 x 9) : 3
= 4608:3
= 1536
C2: (512 x 9) : 3
= 512 x 9 : 3
= 512 x (9 : 3)
= 512 x 3
= 1536