Nếu a = 4, b = 7 thì a x 76 + b x 76 - 76 = 4 x 76 + 7 x 76 - 76
= (4 + 7 - 1) x 76
= 10 x 76
= 760
a x 76 + b x 76 - 76
= 4 x 76 + 7 x 76 - 1 x 76
= (4 + 7 - 1) x 76
= 10 x 76
= 760
4 x 76 + 7 x 76 - 76
= 76 x (4 + 7) - 76
= 76 x 11 - 76
= 836 - 76
= 760
k mik nha !