321+123=?
345+456=?
123+123*234+234*345+345*456+456*567+567*678+678*789+789
tính nhanh
(123 + 345) + (456 -123) -[(2017-(-345)]
123+345+456-123-2017-345
= ( 123 - 123 ) + ( 345 - 345 ) - ( 123 + 2017 )
= 0 + 0 - 2140
= -2140
Trả lời :
( 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
Hok tốt
a)321+456-234=?
b)543-123+456=?
c)234+234-321=?
321 + 456 - 234 = 543
543 - 123 + 456 = 876
234 + 234 - 321 = 147
a) a)321+456-234= 543
b)543-123+456=876
c)321+234-321=234
Tính nhanh tổng sau :
( 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 + 456 - 2017
= 456 - 2017 = -1561
=123+345+456-123-2017-345
=(123-123)+(345-345)+(456-2017)
=0+0+(-1561)
=-1561
123 + 123 = ?
234 + 234 = ?
345 + 345 = ?
456 + 456 = ?
123+123=246
234+234=468
345+345=690
456+456=912
TL :
246
468
690
912
Chúc bn học tốt !
123+123=246
234+234=468
345+345=690
456+456=912
tính hợp lí nếu có thể
123 * 456 + 456 * 321 - 256 *444
\(123.456+456.321-256.444=456.\left(123+321\right)-256.444=456.444-256.444=444.\left(456-256\right)=444.200=88800\)
123.456+456.321-256.444
=456.(123+321)-256.444
=456.444-256.444
=444.(456-256)
=444.200
=88800
\(123\cdot456+456\cdot321-256\cdot444\)
\(=456\left(123+321\right)-256\cdot444\)
\(=456\cdot444-256\cdot444\)
\(=444\left(456-256\right)\)
\(=444\cdot200\)
=88800
Tính nhanh tổng sau:
(123+345)+(456-123)-[2017-(-345)]
Tính Nhanh
123 x 456 + 456 x 321 - 256 x 444
\(123\cdot456+456\cdot321-256\cdot444\)
\(=\left(123+321\right)\cdot456-256\cdot444\)
\(=444\cdot456-256\cdot444\)
\(=444\cdot\left(456-256\right)\)
\(=444\cdot200\)
\(=88800\)
là 88800
hok tốt
Bài làm :
123 x 456 + 456 x 321 - 256 x 444 = 56088 + 146376 - 113664
= 88800
Đ/S : 88800
Ta có: \(123\times456+456\times321-256\times444\)
\(=444\times456-256\times444\)
\(=444\times\left(456-256\right)\)
\(=444\times200\)
\(=444\times200=88800\)
Tích bằng cách hợp lý
123 . 456 + 456 . 321 - 256 . 444
THAM KHẢO
123 *456 + 456 *321 - 256 * 444
= 456 * ( 123 + 321 ) - 256 * 444
= 456 * 444 - 256 * 444
= 444 * ( 456 - 256 )
= 444 * 200
= 88800