1) Tính nhanh
A) 123 . 4564 – 456 . 123123
B) ( 98 . 7676 – 9898 . 76) : ( 2004 . 2002 …..2020)
Làm nhanh hô mink nha , mink dang can gap
1) Tính nhanh A) 123 . 4564 – 456 . 123123 B) ( 98 . 7676 – 9898 . 76) : ( 2004 . 2002 …..2020) Làm nhanh hô mink nha , mink dang can gap
By Margaret
A) 123 . 456456 – 456 . 123123 = [(123 . 456 . 1001) – (456 . 123 . 1001)]
=0
B) ( 98 . 7676 – 9898 . 76) : ( 2004 . 2002 …..2020) = [(98 . 76 . 101) – (98 .101 . 76 )] : ( 2004 . 2002 …..2020)
= 0 .[ -( 2004 . 2002 …..2020)]
=0