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
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
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
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
Bài 6: Tính nhanh:
326 x 728 + 327 x 272
2008 x 867 + 2009 x 133
1235 x 6789x ( 630 - 315 x 2 )
(m : 1 - m x 1) : (m x 2008 + m + 2008)
TICK CHO MÌNH NHA
Giải:
326 x 728 + 327 x 272
= 326 x 728 + 326 x 272 + 272
= 326 x ( 728 +272 ) +272
= 326 x 1000 + 272
= 326 000 +272
= 326 272
TICK CHO MÌNH NHA
Giải:
2008 x 867 +2009 x 133
= 2008 x 867 + 2008 x 133 +133
= 2008 x ( 867 + 133) +133
= 2008 x 1000 +133
= 2 008 000 + 133
= 2 008 133
a) Ta có: \(326\cdot728+327\cdot272\)
\(=326\cdot728+326\cdot272+272\)
\(=32600+272\)
\(=32872\)
b) Ta có: \(2008\cdot867+2009\cdot133\)
\(=2008\cdot867+2008\cdot133+133\)
\(=2008000+133\)
\(=2008133\)
c) Ta có: \(1235\cdot6789\cdot\left(630-315\cdot2\right)\)
\(=1235\cdot6789\cdot0\)
=0
10000 - 47 x 72 - 47 x 28
3457-27 x48 -48 x73 + 6543
10000-47x72-47x28
=10000-47x72-47x47-28
=47x(10000-72-28)
=47x0
=0
MIK CHỈ GIẢI DƯỢC PHẦM ĐẦU THUI
SORRY NHÉ
= 47 x (1000 - 72 - 28 )
= 47 x 0
= 0
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
Bài 5 : Tính nhanh
a, 10000 - 47 * 72 - 47 * 28
b, 3457 - 27 *48 - 48 * 73 + 6543
a) 10000 - 47 . 72 - 47 . 28
= 10000 - 47 ( 72 - 28 )
= 10000 - 47 . 44
= 10000 - 2068
= 7932
b) 3457 - 27 . 48 - 48 . 73 + 6543
= 3457 - 48 ( - 27 - 48 ) + 6543
= 3457 - 48 . ( - 75 ) + 6543
= 3457 - ( - 27 ) + 6543
= 3457 + 27 + 6543
= 10027
a, 10000-47×72-47×28
= 10000-47(72+28)
=10000-47×100
=10000-4700= 5300
Tính nhanh:
54 x 113 + 45 x 113 + 113
54 x 47 - 47 x 53 - 20 - 27
10000 - 47 x 72 - 47 x 28
(145 x 99 + 145) - (143 x 101 - 143)
1002 x 9 - 18
8 x 427 x 3 + 6 x 573 x 4
2008 x 867 + 2009 x 133
a/ = 113 x ( 54 + 45 + 1 ) = 113 x 100 = 11300
b/ = 47 x ( 54 - 53 ) - 20 - 27 = 47 - 20 - 27 = 0
c/ = 145 x ( 99 + 1 ) - 143 x ( 101 - 1 ) = 145 x 100 - 143 x 100 = 100 x ( 145 - 143 ) = 100 x 2 = 200
d/ = 1002 x 9 - 2 x 9 = 9 x ( 1002 - 2 ) = 9 x 1000 = 9000
e/ = 24 x 427 + 24 x 573 = 24 x ( 427 + 573 ) = 24 x 1000 = 24000
f/ Sửa đề bài là :
2008 x 867 + 2008 x 133 = 2008 x ( 867 + 133 ) = 2008 x 1000 = 2008000
Tính nhanh
3457 - 27 x 48 - 48 x 73 +6543
3457 - 27 x 48 - 48 x 73 + 6543
= (3457 + 6543) - (27 x 48 + 48 x 73)
= 10000 - 48 x (27 + 73)
= 10000 - 48 x 100
= 10000 - 4800
= 5200
Ủng hộ mk nha ^_-
kết quảlà 5200 nhé
=( 3457 + 6543 ) - (27 x 48 - 48 x 73)
=10000 - 48 x (27 + 73)
= 10000 - 48 x 100
=10000 - 4800
= 5200