Tính bằng cách thuận tiện nhất.
a) 6666 x 8 + 4444 x 13 b) 74 x 54 - 48 x 27
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A, 27 X 45 + 45 X 74 - 45 =
27 X 45 + 74 X 45 - 45 X 1=
45X[ 27+74 - 1] =
45 X 100 =
4500
B,[ 54 X 28+12 X 54 ] : 36 =
[ 54 X 28 + 54 X 12] : 36=
[ 54 X [ 28 + 12 ] :36=
[54 X 40 ] : 36=
2160 : 36=
60
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48 x 27 + 48 + 96 x 36
= 48 x (27 + 1) + 48 x 72
= 48 x 28 + 48 x 72
= 48 x (28 + 72)
= 48 x 100
= 4800 .
a) 20x4+20x3+20x3
= 20 x ( 4+3 + 3)
= 20 x10
= 200
b) (6x9-54)x(25 +26+27+.........41+42)
= 0 x (25 +26+27+.........41+42)
= 0
20x4+20x3+20x3
= 20 x ( 4+3 + 3)
= 20 x10
= 200
b) (6x9-54)x(25 +26+27+.........41+42)
= 0 x (25 +26+27+.........41+42)
= 0
( 6 x 8 – 48) : ( 10 + 11 + 12 + 13 + 14 + 15 )
= (48 – 48) : ( 10 + 11 + 12 + 13 + 14 + 15 )
= 0 : ( 10 + 11 + 12 + 13 + 14 + 15 )
= 0
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 = \(\dfrac{1}{2}\)
a. $\dfrac{14}{15}+\dfrac{2}{11}+\dfrac{1}{15}+\dfrac{4}{11}+\dfrac{10}{22}$
$=(\dfrac{14}{15}+dfrac{1}{15})+(\dfrac{2}{11}+\dfrac{4}{11}+\dfrac{10}{22})$
$=1+1=2$
b. $74\times43-43+27\times43$
$=(74-1+27)\times43$
$=100\times43=4300$
\(a)\dfrac{14}{15}+\dfrac{2}{11}+\dfrac{1}{15}+\dfrac{4}{11}+\dfrac{10}{22}\)
\(=\left(\dfrac{14}{15}+\dfrac{1}{15}\right)+\dfrac{2}{11}+\dfrac{4}{11}+\dfrac{5}{11}\)
\(=1+1=2\)
\(b)74\times43-43+27\times43\)
\(=43\times\left(74-1+27\right)\)
\(=43\times100=4300\)
a. ( 6 x 8 – 48 ) : ( 10 + 11 + 12 + 13 + 14 + 15 )
= (48 – 48) : ( 10 + 11 + 12 + 13 + 14 + 15 )
= 0 : ( 10 + 11 + 12 + 13 + 14 + 15 )
= 0
a) 6666 x 8 + 4444 x 13
= 2222 x (3 x 8) + 2222 x (2 x 13)
= 2222 x 24 + 2222 x 26
= 2222 x (24 + 26)
= 2222 x 50
= 1111 x (2 x 50)
= 1111 x 100
= 111 100
b) 74 x 54 - 48 x 27
= (74 x 2) x 27 - 48 x 27
= 148 x 27 - 48 x 27
= (148 - 48) x 27
= 100 x 27
= 2 700
a) 6666x8+4444x13
=1111x6x8+1111x4x13
=1111x48+1111x52
=1111x(48+52)
=1111x100=111100
b)74x54-48x27
=74x2x27-48x27
=148x27-48x27
=(148-48)x27
=100x27=2700