有理数的!1.(-6.91)*40+6.91*(-60)2.6.3*(-1/9)*(-3右4/7)3.(-1/2)*2/3*(-3/4)*4/5*(-5/6)*6/7*(-7/8)*8/9*(-9/10)4.(1/2-1)*(1/3-1)*(1/4-1)*(1/5-1)*(1/6-1)*(1/7-1)5.(-0.125)*(-50%)+0.125*20%+(-0.125)*70%6.(-50右3/4)*(-0.8)+50.75*0.2+50右3/4*(-100%)7.

Question

有理数的!
1.(-6.91)*40+6.91*(-60)
2.6.3*(-1/9)*(-3右4/7)
3.(-1/2)*2/3*(-3/4)*4/5*(-5/6)*6/7*(-7/8)*8/9*(-9/10)
4.(1/2-1)*(1/3-1)*(1/4-1)*(1/5-1)*(1/6-1)*(1/7-1)
5.(-0.125)*(-50%)+0.125*20%+(-0.125)*70%
6.(-50右3/4)*(-0.8)+50.75*0.2+50右3/4*(-100%)
7.99*100右1/99
8.-98*100右2/98\
麻烦写的完整一点可以吗？

Answer 1

1.-6.91*(40+60)=691
2.(63/10)*(-1/9)*(-25/7)=(63/10)*(25/63)=2.5
3.-1/10
4.(-1/2)*(-2/3)*(-3/4)*(-4/5)*(-5/6)*(-6/7)=1/7
5.0.125*(50%+20%-70%)=0
6.50.75*(0.8+0.2-100%)=0
7.99*(100+1/99)=9900+1=9901
8.-98*(100+2/98)=-9800+(-2)=-9802