Toán tính nhanh a, 72,99 – 41,09 – 21,90 b, 7/4+17/3+5/4+4/3 27/09/2021 By Sadie tính nhanh a, 72,99 – 41,09 – 21,90 b, 7/4+17/3+5/4+4/3
`a)` `72,99` `-` `41,09` `-` `21,90` `=` `72,99` `-` `21,90` `-` `41,09` `=` `51,09` `-` `41,09` `=` `10` `b)` `7/4` `+` `17/3` `+` `5/4` `+` `4/3` `=` `(` `7/4` + `5/4` `)` `+` `(` `17/3` `+` `4/3` `)` `=` `12/4` + `21/3` `=` `3` `+` `7` `=` `10` Trả lời
a) 72,99 – 41,09 – 21,90 = 72,99 – ( 41,09 + 21,90) =10 b) 7/4+17/3+5/4+4/3 =(7/4+5/4)+(17/3+4/3) =12/4+21/3 =36/12+84/12 = 120/12=10 Chúc bạn học tốt nhé! Cho mk xin vote 5* nha Trả lời
`a)` `72,99` `-` `41,09` `-` `21,90`
`=` `72,99` `-` `21,90` `-` `41,09`
`=` `51,09` `-` `41,09`
`=` `10`
`b)` `7/4` `+` `17/3` `+` `5/4` `+` `4/3`
`=` `(` `7/4` + `5/4` `)` `+` `(` `17/3` `+` `4/3` `)`
`=` `12/4` + `21/3`
`=` `3` `+` `7`
`=` `10`
a) 72,99 – 41,09 – 21,90
= 72,99 – ( 41,09 + 21,90)
=10
b) 7/4+17/3+5/4+4/3
=(7/4+5/4)+(17/3+4/3)
=12/4+21/3
=36/12+84/12
= 120/12=10
Chúc bạn học tốt nhé!
Cho mk xin vote 5* nha