186 X X – X X 86 =3400 C

câu 2 - HE THONG DE THI HSG 4
Lớp 4 HE THONG DE THI HSG 4

Câu 2(2đ):

Tìm x : a.7x (x-11)-6=757 b.186 x x – x x 86 =3400 c. 2006 - (137 - x) x12=(x x 8)+858