a) = 17,89-4,89 : 25
= 13 : 25
= 0,52
a) 17,89:25-4,89:25
=(17,89 -4,89):25
= 13 :25
= 0,52
b) a là bao nhiêu?
a) 17,89 : 25 - 4,89 : 25
= (17,89-4,89) : 25
= 13:25
= 0,52
b) 28 + 62 .a.(a.1-a:1)+28.8+28
= 28+62.a.0+28.8.28
= 28+28.8+28
= 28 .( 1+8+1)
= 28.10
= 280