(1)原式=-9*2=-18,
(2)原式=1/2+(-2/3)++4/5+(-1/2)+(-1/3)
=1/2-1/2-(2/3+1/3)+4/5
=-1/5
(3)原式=-1.5-5.5+(4.25+2.75)
=-7+7
=0
(4)原式=40-63
=-23
(5)原式=4-5×(-1/8)
=4+0.625
4.625
(6)原式=-(2/5+0.6)-5/6+4.9
=-1-5/6+4.9
=46/15(三又十五分之一)
(7)原式=100÷5×(-2/5)
=-8
(8)原式=-125×9/25=-45
(9)原式=-30-16÷(-8)=-30+2=-28
(10)原式=9/4×(-6/7)÷(-3/2)=81/28