Nguyễn Minh Quang
Quản lý
ta có
a.\(15.\left(-20\right).\left[12.\left(-11\right)-\left(-3\right).11\right]=15.\left(-20\right).\left(-11\right)\left[12.+\left(-3\right)\right]\)
\(=15.20.11.8=\left(15.8\right).20.11=120.20.11=2400.11=26400\)
b.\(\left(-2\right).\left(-3\right).\left(-5\right)-5-\left(-8\right)=-2.3.5-5+8=-30+3=-27\)