Bỏ dấu ngoặc rồi tính:
a,(35+75)+(345-35-75)
b,-(515-80+91)-(2003+80-91)
c,25-(-17)+24-12
d,235-(34+135)-100
AI NHANH 5 SAO VÀ 1 CÂU TRẢ LỜI HAY
Bỏ dấu ngoặc rồi tính: a,(35+75)+(345-35-75) b,-(515-80+91)-(2003+80-91) c,25-(-17)+24-12 d,235-(34+135)-100 AI NHANH
By Brielle
a, (35+75)+(345-35-75)
= 35 + 75 + 345 – 35 – 75
= ( 35 -35 ) + ( 75 – 75 ) + 345
= 0 + 0 + 345
= 345
b,- (515- 80+ 91) – (2003 + 80 -91)
= – 515 + 80 – 91 – 2003 – 80 + 91
= ( 80 – 80 ) + ( -91 + 91 ) + ( -515 – 2003 )
= 0 + 0 + ( – 2518 )
= – 2518
c, 25 – (-17) + 24 – 12
= 25 + 17 + 24 – 12
= ( 25 + 24 ) + ( 17 – 12 )
= 49 + 5
= 54
d, 235 – (34+135 ) -100
= 235 – 34 – 135 – 100
= ( 235 – 135) + ( -34 ) – 100
= 100 + ( – 34 ) – 100
= ( 100 – 100 ) + ( – 34 )
= 0 + ( – 34 )
= 0 – 34
= – 34
Đáp án:
`a,(35+75)+(345-35-75)`
`= 35 + 75 + 345 – 35 – 75`
`= (35 -35) + (75 – 75) + 345`
`= 0 + 0 + 345`
`= 345`
`b,-(515-80+91)-(2003+80-91)`
`= -515 + 80 – 91 – 2003 – 80 + 91`
`= -515 + (80 – 80) + [(-91) + 91] – 2003`
`= -515 + 0 + 0 – 2003`
`= -515 – 2003`
`= -2518`
`c, 25 – (-17) + 24 – 12`
`= 25 + 17 + 24 – 12`
`= 54`
`d,235 – (34 + 135) – 100`
`= 235 – 34 – 135 – 100`
`= (235 – 135) – 100 – 34`
`= 100 – 100 – 34`
`= 0 – 34`
`= -34`