几道初中的计算题~
(-1000)x(3/10-1/2+1/5-0.1)=
(-.359)x(-4/7)-2.14x(-4/7)+6x(14/7)=
19 13/14x(-14)=
(1/50-1)(1/49-1)(1/24-1)...(1/4-1)(1/3-1)(1/2-1)=