Question

abcde4 x 4 =4abcde

tìm abcde4

Answer 1

abcde4 . 4=4abcde

=> (abcde.10+4)4=400000 +abcde

=>abcde.40+16=400000+abcde

=> 39.abcde=399984

=>abcde=10256=> abcde4=102564

Answer 2

abcde4 . 4 = 4abcde

(abcde.10+4).4 =4.100000 + abcde

abcde.10.4+4.4 = 400000 + abcde

abcde.40 + 16 = 400000 + abcde

abcde.40-abcde= 400000-16

abcde.(40-1) = 399984

abcde . 39 = 399984

abcde = 399984 : 39

abcde = 10256

Vậy abcde = 10256