1.Tìm y
a) y3 + 3y = 12 x 11
b) 64 x y + 225 = 700 - 75 - 36 x y
2.Tính
a)\(\frac{4343}{7171}+\frac{4343}{7171}+\frac{4343}{7171}+\frac{4343}{7171}\)
b) A = \(\frac{1}{33}\times\left(\frac{33}{12}+\frac{3333}{2020}+\frac{333333}{303030}+\frac{33333333}{42424242}\right)\)