123 + 234 + 357 + 466
Tính nhanh: 563 + 234 + 377 + 466 = ?
563 + 234 + 377 + 466
= (563 + 377) + (234 + 466)
= 940 + 700
= 1640
Tính thử lại đi sai rùi đó
\(563+234+377+466\)
\(\Rightarrow\left(563+377\right)+\left(234+466\right)\)
\(\Rightarrow940+700\)
\(\Rightarrow1640\)
\(HT\)
123 + 123 = ?
234 + 123 ........ 234 + 123
123 + 123= 246
234 + 123 = 234 + 123
a) ( 3567 – 214) – 3567;
b) ( - 2017) – ( 28 – 2017);
c) -( 269 – 357 ) + ( 269 – 357 );
d) ( 123 + 345) + (456 – 123) –[2017– (-345)]
a) ( 3567 -214) - 3567
= 3567 - 214 -3567
= ( 3567-3567) - 214
= - 214
b) ( -2017) -( 28-2017)
= -2017 - 28 + 2017
= ( -2017 + 2017) -28
= 0 - 28
= -28
a, ( 3567 - 214 ) - 3567
= 3566 -214 - 3567
= -214
b, - 2017 - ( 28- 2017 )
= - 2017 -28 + 2017
= - 28
c, - ( 269 - 357 ) + ( 269 - 357 )
= -269 + 357 + 269 - 357
= 0
Câu d tự lm nhé
@@ Học tốt
# Chiyuki Fujito
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
123+123*234+234*345+345*456+456*567+567*678+678*789+789
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#
(x+17)+-(24+35)
(-32)-(y+20)+20
(3567-214)-3567
(-2017)-(28-2017)
(-269-357)+(269-357)
(123+345)+(456-123)-[2017-(-345)]
234 + 234 - 123=^^^^^^^^
\(234+\left(234-123\right)\)
\(=234+111\)
\(=345\)
\(tíchmknha\)
Tính nhanh
1 \(\frac{1}{123}\).2\(\frac{1}{357}\)-\(\frac{1}{123}\)-\(\frac{1}{357}\)