怎么做 谢谢
3个回答
展开全部
(1)99又8/9*(-13)
=99+8/9*(-13)
=(100-1+8/9)*(-13)
=(100-1/9)*(-13)
=-1300+13/9
=-1298-18/9+13/9
=-1298又5/9
(2)(-125)*(-25)*(-5)*(+2)*(-4)*(-8)
=(-125)*(-8)*(-25)*(-4)*(-5)*(+2)
=1000*100*(-10)
=-1000000
(3)(-5)*3又1/3+2*3又1/3+(-6)*3又1/3
=3又1/3*[(-5)+2+(-6)]
=10/3*(-9)
=10*(-3)
=-30
=99+8/9*(-13)
=(100-1+8/9)*(-13)
=(100-1/9)*(-13)
=-1300+13/9
=-1298-18/9+13/9
=-1298又5/9
(2)(-125)*(-25)*(-5)*(+2)*(-4)*(-8)
=(-125)*(-8)*(-25)*(-4)*(-5)*(+2)
=1000*100*(-10)
=-1000000
(3)(-5)*3又1/3+2*3又1/3+(-6)*3又1/3
=3又1/3*[(-5)+2+(-6)]
=10/3*(-9)
=10*(-3)
=-30
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询