计算:(1)(-12+13-14-15)×(-20)(2)-56×(12-225-0.6)(3)(-29)×(-18)+(-511)×(-3)×215.-数学
题文
计算: (1)(-
(2)-
(3)(-
|
答案
(1)(-
=-
=10-
=19-
=
(2)-
=(-
=-10+2+0.5, =-10+2.5, =-7.5; (3)(-
|
题文
计算: (1)(-
(2)-
(3)(-
|
答案
(1)(-
=-
=10-
=19-
=
(2)-
=(-
=-10+2+0.5, =-10+2.5, =-7.5; (3)(-
|