`a,275xx23+725xx23`
`=23xx(275+725)`
`=23xx1000=23000`
`b,9/7xx4/5-2/7xx4/5`
`=4/5xx(9/7-2/7)`
`=4/5xx1=4/5`
275 nhân 23+725 nhân 23
=[275+725] nhân 23
=1000 nhân 23
=23000
9/7 nhân 4/5-2/7 nhân 4/5
=[9/7-2/7] nhân 4/5
=1 nhân 4/5
=4/5
`a)275xx23+725xx23`
`=23xx(275+725)`
`=23xx1000`
`=23000`
`b)9/7xx4/5-2/7xx4/5`
`=4/5xx(9/7-2/7)`
`=4/5xx7/7`
`=4/5xx1`
`=4/5`
=23x(275725)
=23x1000=23000
=4/5x(9/7-2/7)
=4/5x1=4/5
a)
=275 x 23 + 725 x 23
= 23 x (275 +725)
= 23 x 1000
= 23000
b) 9/7 x 4/5 - 2/7 x 4/5
= 45×(9/7−2/7)
= 45×7/7
= 45×1
= 45
a) 275×23+725×23
=23×(275+725)
=23×1000
=23000
b) 9/7×4/5−2/7×4/5
=4/5×(9/7−2/7)
=4/5×1
=4/5
