Tính nhanh:
a) 357 x 5 – 357 + 357 x 6
Tính nhanh :
( 367 x 584 + 12345 ) x ( 3570 : 357 -10 )
=(367 x 584 + 12345) x (10 - 10)
= (367 x 584 + 12345) x 0
=0
=(367 x 584 + 12345) x (10 - 10)
=(367 x584 + 12345) x 0
=0
( 367 x 584 + 12345 ) x ( 3570 : 357 - 10 )
= ( 367 x 584 + 12345 ) x ( 10 - 10 )
= ( 367 x 584 + 12345 ) x 0
= 0
Tìm X:
357:X=5 dư 7
357:(X+5)=5 dư 7
A) => X = ( 357 - 7 ) : 5
=> X = 350 : 5
=> X = 70
B)
=> ( x + 5 ) = ( 357 - 7 ) : 5
=> x + 5 = 350 : 5
=> x + 5 = 70
=> x = 70 - 5
=> x = 65
(27569 + 4568 + 357) - (27564 + 357 + 4573)
Tính nhanh
(27569+4568+375)-(27564+357+4573)
=27569+4568+357-27564-357-4573
=27569-27564+357-357+4568-4573
=5+0+(-5)
=0
27569 + 4568 + 357 - 27564 - 357 - 4573
= ( 27569 - 27564) + ( 4568 - 4573) + (357 - 357)
= 5 - 5 + 0
= 0
( 27569 + 4568 + 357 ) - ( 27564 + 357 + 4573 )
= 27569 + 4668 + 357 - 27564 - 357 - 4573
= 27569 - 27564 + 357 - 357 + 4568 - 4573
= 5 + 0 + ( - 5 )
= 0
Tính nhanh nếu có thể ( áp dụng quy tắc dấu ngoặc )
a, - (269 - 357) + (269 - 357)
b, (123 + 345) + (456 -123) - [ 2017 - (-345) ]
a, -(269-357)+(269-357).
=-269+357+269-357.
=0.
b,(123+345)+(456-123)-[2017-(-345)].
=123+345+456-123-2017-345.
=-1561.
a) - ( 269 - 357 ) + ( 269 - 357 )
= - 269 + 357 + 269 - 357
= [( - 269 ) + 269 ] + [(-357) + 357 ]
= 0 + 0
= 0
b) ( 123 + 345 ) + ( 456 - 123 ) - [ 2017 - ( -345 ) ]
= 123 + 345 + 456 - 123 - [ 2017 + 345 ]
= 123 + 345 + 456 - 123 - 2017 - 345
= ( 123 - 123 ) + ( 345 - 345 ) + 456 - 2017
= 0 + 0 + ( - 1561 )
= ( - 1561 )
@ Học tốt @
Nhớ k cho mình nha !!!!! Thank
a, - (269 - 357) + (269 - 357)
\(=-269+357+269-357\)
= 0
b, (123 + 345) + (456 -123) - [ 2017 - (-345) ]
= 123 + 345 + 456 - 123 - 2017 - 345
= 456 - 2017
= -1561
!! Hơi tắt
@@ Học tốt @@
## Chiyuki Fujito
Tìm x
a) x - 357 = 53435
b) x : 5 = 1304
357 : X =5(dư 7)
X : 23 =45(dư 6)
7 *(X-11)-6=757
357 : X =5(dư 7)
X = ( 357 - 7 ) : 5
X = 350 : 5
X = 70
Vậy X = 70.
X : 23 =45(dư 6)
X = 45 x 23 + 6
X = 1041
Vậy X = 1041.
7 x (X-11)-6=757
7 x (X-11) = 757 + 6
7 x (X-11) = 763
X - 11 = 763 : 7
X - 11 = 109
X = 109 + 11
X = 120
Vậy X = 120.
Hok tốt !
x bawngf120 hok tốt
nha
Thực hiện phép tính trên tập Z
1) (- 49) + 153 + (- 31) 2) (- 215) + 115 + (- 83) 3) 154 + (- 68) + (- 254) + 368 | 4) 146 + (- 37) + 254 + (- 163) 5) - (- 357) + 27 + (-357) + (- 32) 6) (- 25) + 15 + (- 17) – (- 25) + (-13) |
Tính nhanh các tổng sau :
a) (3567 - 214) - 3567
b) (-2017) - (28 - 2017)
c) -(269 - 357) + (269 - 357)
d) (123 + 345) + (456 - 123) -[ 2017 - (345)]
\(a)\left(3567-214\right)-3557\)
\(=3567-214-3567\)
\(=\left(3567-3567\right)-214\)
\(=0-214=-214\)
\(b)\left(-2017\right)-\left(28-2017\right)\)
\(=\left(-2017\right)-28+2017\)
\(=\left[\left(-2017\right)+2017\right]-28\)
\(=0-28=-28\)
\(c)-\left(269-357\right)+\left(269-357\right)\)
\(=\left(-269\right)+357+269-357\)
\(=\left[\left(-269\right)+269\right]+\left(357-357\right)\)
\(=0+0=0\)
\(d)\left(123+345\right)+\left(456-123\right)+\left[2017-\left(345\right)\right]\)
\(=123+345+456-123+2017-345\)
\(=\left(123-123\right)+\left(345-345\right)+456+2017\)
\(=0+0+456+2017\)
\(=2473\)
#Mạt Mạt#
Tính nhanh tổng sau :
a) (-2017) - ( 28 - 2017)
c) -(269-357) + (269 - 357)
d) (123 + 345) +(456 -1230-[ 2017 -(-345)]
b) (17 -229) + (17-25+229)
a) (-2017)- (28- 2017)
= -2017 -28 +2017
= (-2017 +2017) -28
= 0 -28
= -28
b) (17-299) +(17-26+299)
=17 -229 +17 -25 +229
=(17 +17) -(229 +229) -25
=34 -0 -25
=9
c) - (269 -357) + (269 -357)
=-269 +357 +269 -357
=(-269 +269) +(357 -357)
= 0 +0 =0
d) (123 +345) + (456 -1230 - (2017 - (-345)))
=123 +345 +456 -1230 -2017 -345
=(345 -345) + (123 -1230) + (456 -2017)
=0 + (-1107) + (--1561)
= -2668