麻烦计算一下下列8道数学题,写过程,要详细……(用初一简便方法,谢谢回答) (1)(-10(
麻烦计算一下下列8道数学题,写过程,要详细……(用初一简便方法,谢谢回答) (1)(-10(
日期:2011-09-24 11:57:28 人气:1
(1)=-(10*8.24*0.1)
=-8.24
(2)=81/20*1.25*8
=81/20*10
=81/2
(3)=36*-7/9+36*5/6+36*3/4-36*7/18
=-28+30+27-14
=-(28+14)+(27+30)
=-42+57
=57-42
=15
(4)=-((31+15/16)*8)
=-(31*8+15&