100*（7/10-1/5+2/1-0.01)=______ (-2/1)*(-7/4)*(-8)=________ 两道题请大虾们帮帮小妹

题目

100*（7/10-1/5+2/1-0.01)=______ (-2/1)*(-7/4)*(-8)=________ 两道题请大虾们帮帮小妹

答案

100*（7/10-1/5+2/1-0.01)
=100*（7/10-2/10+5/10-0.01）
=100*0.09
=9
(-2/1)*(-7/4)*(-8)
=7/8*(-8)
=-7