tính nhanh:19x64+76x34
1.Tính nhanh
19x64+76x34=?
Ta có: 19x4x16+76x34
=76x16+76x34
=76x(16+34)
=76x50
=3800
\(19\cdot64+76\cdot34\)
=\(19\cdot4\cdot16+76\cdot34\)
=\(76\cdot16+76\cdot34\)
=\(76\cdot\left(34+16\right)\)
=\(76\cdot50\)
=\(76:2\cdot100\)
=\(36\cdot100=3600\)
k cho mh nha bạn
Tính nhanh:
a) 19x64-76x34
b)136x68+16x272
19x64-76x34=-1368
136x68+16x272=13600
ung ho nha
tinh nhanh:
19x64+76x34
136x68+16x272
19x64+76x34
=19x4x16+76x34
=76x16+76x34
=76x(16+34)=76x50=3800
tinh nhanh
19x64+76x34=
136x68+16x272=
*19x64+76x34=
19x64x19x4x34
19x64x19x136
19x(64+136)
19x200
3800
* 136x68+16x272=
136x68+16x2x136
136x68+32x136
136x(68+136)
136x200
27200
Giải
19 x 64 + 76 x 34 = 19 x 64
= 1216
= 1216 + ( 76 x 34 )
= 1216 + 2584
= 3800.
Câu 2 : Giải
136 x 68 + 16 x 272 = 136 x 68
= 9248
= 9248 + ( 16 x 272 )
= 9248 + 4352
= 13600.
19x64+76x34=?
19.64+76.34
=19.4.16+76.34
=76.16+76.34
=76.(16+34)
=76.50
3800
tính nhanh
a,19x64+76x34
b,35x12+65x13
c,135x68+16x272
d,(2+4+6+...+1000)x(36x333-108x111)
mk đâng cần gấp
a, 19 x 64 + 76 x 34
= 19 x 2 x 32 + 38 x 2 x 34
= 38 x 32 + 38 x 68
= 38 x ( 32 + 68 )
= 38 x 100
= 3800
b, 35 x 12 + 65 x 13
= 35 x 12 + 65 x 12 + 65
= ( 35 + 65 ) x 12 + 65
= 100 x 12 + 65
= 1200 + 65
= 1265
d, ( 2 + 4 + 6 + ... + 1000) x ( 36 x 333 - 108 x 111 )
= ( 2 + 4 + 6 + ... + 1000 ) x ( 36 x 3 x 111 - 108 x 111)
= ( 2 + 4 + 6 + ...+ 1000 ) x ( 108 x 111 - 108 x 111 )
= ( 2 + 4 + 6 + ... + 1000 ) x 0
= 0
Câu c chịu
a)19 x 64 + 76 x 34
=> 3800
b) 35 x 12 + 65 x 13
=> 1265
c. 135 x 68 + 16 x 272
=>(135 + 68) x (16 x 272)
=>135132
Tính nhanh:
a) (1+2+3+..+100) x (12 +22+32+...+...102) x ( 65.111-13.15.37)
b)19x64+76x34
c)12x35+65x13
a Ta có
(1+2+3....+100).(1^2+2^2+..+10^2).(13.5.3.37-13.15.37)
=(1+2...+100).(1^2+2^2+...+10^2).0=0
b Ta co
19.64+76.34=19.4.16+76.34=76.16+76.34=76(16+34)=76.50=3100 ( cau c tuong tu )
Thực hiện phép tính bằng cách hợp lý:
19x64+76x34
35x12+65x13
19991999x1998-19981998x1999
( 2+4+6+... +100) x ( 36x 333 -108 x111)
\(19.64+76.34\)
\(=19.64+19.4.34\)
\(=19.64+19.136\)
\(=19.\left(64+136\right)\)
\(=19.200\)
\(=3800\)
\(35.12+65.13\)
\(=5.7.12+5.13.13\)
\(=5.84+5.169\)
\(=5.\left(84+169\right)\)
\(=5.253\)
\(=1265\)
\(19991999.1998-19981998.1999\)
\(=1999.10101.1998-1998.10101.1999\)
\(=0\)
\(\left(2+4+6+......+100\right).\left(36.333-108.111\right)\)
\(=\left(2+4+6+........+100\right).\left(36.3.111-108.111\right)\)
\(=\left(2+4+6+........+100\right).\left(108.111-108.111\right)\)
\(=\left(2+4+6+.......+100\right).0\)
\(=0\)
19x64+76x34
=19x64+19x4x34
=19x(64+136)
=19x200=3800
35x12+65x13
=5x7x12+5x13x13
=5x(7x12+13x13)
=5x253=1265
19991999x1998-19981998x1999
=1999x10001x1999-1998x10001x1999
=0
( 2+4+6+... +100) x ( 36x 333 -108 x111)
=(2+4+6+...+100)x(36x111x3-36x3x111)
=(..................tự điền, như trên thôi)x0=0
Tính nhanh
a 16x64+76x34
b 35x12+65x13
c 136x68+16x272
d 2018x2018x2019-2019x2019x2018