Bài 1:
a) Ta có: \(\left(-57\right)\cdot\left(-34\right)-57\cdot64\)
\(=\left(-57\right)\cdot\left(-34\right)+\left(-57\right)\cdot64\)
\(=\left(-57\right)\cdot\left(-34+64\right)\)
\(=-57\cdot30=-1710\)
b) Ta có: \(213\cdot\left(-43\right)+43\cdot23\)
\(=-213\cdot43+23\cdot43\)
\(=43\cdot\left(-213+23\right)\)
\(=43\cdot\left(-190\right)=-8170\)
a)Biểu thức = \(\left(-57\right).\left(-34\right)+\left(-57\right).64\)
\(\left(-57\right)\left(-34+64\right)\)\(=\left(-57\right).30=-1710\)
b) Biểu thức = \(43.\left(-213\right)+43.23\)
\(=43.\left(-213+23\right)\)\(=43.\left(-190\right)\)
\(=-8170\)
