Tính nhanh
3457 - 27 x 48 - 48 x 73 +6543
3457 - 27 x 48 - 48 x 73 + 6543
tính nhanh giúp mình nhé
iiuiuuiuuuiuuuuiuuuuu
A = 3457 - 27\(\times\) 48 - 48 \(\times\) 73 + 6543
A =(3457 + 6543) - ( 27 \(\times\) 48 + 48 \(\times\) 73)
A = 10 000 - 48 \(\times\) ( 27 + 73)
A = 10 000 - 48 \(\times\) 100
A = 100 \(\times\) ( 100 - 48)
A = 100 \(\times\) 52
A = 5200
A = 3457 - 27 48 - 48 73 + 6543
A =(3457 + 6543) - ( 27 48 + 48 73)
A = 10 000 - 48 ( 27 + 73)
A = 10 000 - 48 100
A = 100 ( 100 - 48)
A = 100 52
A = 5200
HT!
Bài 5*: Tính nhanh:
10000 - 47 x 72 - 47 x 28 3457 - 27 x 48 - 48 x 73 + 6543
=
1000 - 47 . 72 - 47 .28
= 47 . ( 1000 - 72 -28 )
= 47 .0
=0
3457 - 27 . 48 - 48 .73 + 6543
=3457 - 48 . (27 + 73 ) + 6543
= 3457 - 4800 + 6543
= 5200
3457 - 27 x 48 - 48 x 73 + 6543 = ???????
giúp mk với
đơn giản mà
3457-(27.48)-(48.73)+6543=5200
bài 7:tính nhanh
a (145 x 99+145)-(143 x 102-143) b,54 x 47 - 47 x 53 - 20 -27
c, 10000 - 47 x 72 - 47 x 28 d, 3457 - 27 x 48 - 48 x 73 + 6543
a) \(\left(145\times99+145\right)-\left(143\times102-143\right)\)
\(=\left[145\times\left(99+1\right)\right]-\left[143\times\left(102-1\right)\right]\)
\(=\left(145\times100\right)-\left(143\times101\right)\)
\(=14500-14443\)
\(=57\)
b) \(54\times47-47\times53-20-27\)
\(=47\times\left(54-53\right)-20-27\)
\(=47-20-27\)
\(=0\)
c) \(10000-47\times72-47\times28\)
\(=10000-47\times\left(72+28\right)\)
\(=10000-47\times100\)
\(=10000-4700\)
\(=5300\)
d) \(3457-27\times48-48\times73+6543\)
\(=\left(3457+6543\right)-48\times\left(27+73\right)\)
\(=10000-48\times100\)
\(=10000-4800\)
\(=5200\)
tinh nhanh
1000 - 47 x 72 - 47 x 28
3457 -27 x 48 - 48 x 73 + 6543
a/ 1000 - 47 x 72 - 47 x 28
= 1000 - 47 x (72 + 28)
= 1000 - 47 x 100
= 1000 - 4700
= -3700
b/ 3457 - 27 x 48 - 48 x 73 + 6543
= 3457 - 48 x (27 + 73) + 6543
= (3457 + 6543) - 48 x 100
= 10000 - 4800
= 5200
k mk nha, mk trả lời đầu tiên đấy
3457 -27 x48 -48 x 73 +6543
(viết cách làm sẽ được tích)
Tính nhanh: a) 0,125 + 21,075 + 88,36 + 9,875 + 78,925 + 11,64 b) 3457 - 27 x 48 - 48 x 73 + 6543 c) (792,81 0,25 + 792,81 0,75) (11x 9 – 900 x 0,1 - 9)
Tính nhanh:
a) 0,125 + 21,075 + 88,36 + 9,875 + 78,925 + 11,64
= \((0,125+9,875)+(21,075+78,925)+(88,36+11,64)\)
= \(10+100+100\)
= \(210\)
b) 3457 - 27 . 48 - 48 . 73 + 6543
= \((3457 +6543) - (27 . 48 + 48 . 73)\)
\(= 10000 - 48 . (27 + 73) \)
\(= 10000-48.100\)
\(= 10000 - 4800\)
\(= 5200\)
c) (792,81. 0,25 + 792,81 0,75). (11. 9 – 900 . 0,1 - 9)
= [ 792,81 . ( 0,25 + 0,75 ) ] . ( 99 - 90 - 9 )
= [ 792,81 . 1 ] . ( 9 - 9)
= 792,81 . 0
= 0
3457 - 27 x 48 - 48 x 73 +6543
326 x 728 + 327 x 272
2008 x 867 + 2009 x 133
10000 - 47 x 72 - 47 x28
3457 - 27 x 48 - 48 x 73 + 6543
=3457 - 48 x ( 27 + 73) + 6543
=3457 - 48 x 100 + 6543
=(3457+ 6543) - 4800
=10000- 4800
=5200
Bài 3: Tính bằng cách thuận tiện
a) 10000 – 47 x 72 – 47 x 28
b) 3457 – 27 x 48 – 48 x 73 + 6543
c) (145 x 99 + 145 ) – ( 143 x 102 – 143 - 143 )
c)(145x99+145)-(143x102-143)
= 145x(99+1)-143x(101-1)
= 145x100-143x100
= (145-143)x100
= 2x100
= 200