`a) 127 + 29 + 73`
`= (127+73)+29`
`= 200 + 29`
`= 229`
`c) 135 + 360 + 65 + 40`
`= (135+65)+(360+40)`
`= 200+400`
`= 600`
`c) 417-17-299`
`= (417-17)-299`
`= 400 - 299`
`= 101`
`d) 981-781+29`
`= (981-781)+29`
`= 200 + 29`
`= 229`
a) 127 + 29 + 73 = 229
b) 135 + 360 + 65 + 40 = 600
c) 417 - 17 - 299 = 104
d) 981 - 781 + 29 = 229
Chúc bạn học tốt!! ^^
a)127+29+73)127+29+73
=(127+73)+29=(127+73)+29
=200+29=200+29
=229=229
c)135+360+65+40)135+360+65+40
=(135+65)+(360+40)=(135+65)+(360+40)
=200+400=200+400
=600=600
c)417−17−299)417-17-299
=(417−17)−299=(417-17)-299
=400−299=400-299
=101=101
d)981−781+29)981-781+29
=(981−781)+29=(981-781)+29
=200+29=200+29
=229
đáp án đây nhé
a) 127 + 29 +73 = (127 + 73) + 29 = 200 + 29 = 229
b) 135 + 360 + 65 + 40 = (135 + 65) + (360 + 40) = 200 + 400 = 800
c) 417 - 17 - 299 = 400 - 299 = 101
d) 981 - 781 + 29 = 200 + 29 = 229
