Question

(15-10:2):(5+15+7:3)-(9-7)×(8×2-2×9) va dau coroane ​

Answer 1

$(15-10:2):(5+15+7:3)-(9-7)\cdot(8\cdot 2-2\cdot 9)=\\=(15-5):(20+2,(3))-2\cdot(16-18)=\\=10:22,(3)-2\cdot(-2)=\\=\frac{30}{67}+4=\frac{298}{67}=\boxed{4\frac{30}{67}}$