Bài 5:
a: \(\left(-93\right)\cdot11\)
\(=\left(-93\right)\cdot\left(10+1\right)\)
\(=-93\cdot10-93\cdot1\)
=-930-93
=-1023
b: \(341\cdot\left(-21\right)\)
\(=-341\cdot21\)
\(=-341\left(20+1\right)\)
\(=-341\cdot20-341\cdot1\)
=-6820-341
=-7161
c: \(\left(-35\right)\cdot101\)
\(=-35\left(100+1\right)\)
\(=-35\cdot100-35\cdot1\)
=-3500-35
=-3535
d: \(29\cdot\left(-99\right)\)
\(=-29\cdot99\)
\(=-29\left(100-1\right)=-29\cdot100+29\cdot1\)
=-2900+29
=-2871
Bài 6:
a: \(\left(-13\right)\cdot5=-65< 0\)
b: \(200>0;200\cdot\left(-3\right)=-600< 0\)
Do đó: \(200>200\cdot\left(-3\right)\)
c: \(\left(-17\right)\cdot2=-34\)
mà -34<-17
nên \(\left(-17\right)\cdot2< -17\)