Question

(-19)*91+91*(-81),2.(-36)*200又18分之7,3.(-270)*4分之1+0.25*21.5+

Answer 1

(-19)*91+91*(-81)

=91*(-19-81)

=91*(-100)

=-9100

(-36)*200又18分之7

=(-36)*(200+7/18)

=-7200-14

=-7214

(-270)*4分之1+0.25*21.5+(-8又2分之1)*(-25%)

=(-270)*0.25+0.25*21.5+8.5*0.25

=0.25*(-270+21.5+8.5)

=0.25*(-240)

=-60