怎样算简便就怎样算21.7-58+8.3-38215÷[1-(15+13)]78×1213+78÷13.2.5×(1.9+1.9+1.9+1.9)-数学
题文
怎样算简便就怎样算 21.7-
2.5×(1.9+1.9+1.9+1.9) |
答案
(1)21.7-
=21.7+8.3-(
=30-1 =29; (2)
=
=
=
(3)
=
=
|
题文
怎样算简便就怎样算 21.7-
2.5×(1.9+1.9+1.9+1.9) |
答案
(1)21.7-
=21.7+8.3-(
=30-1 =29; (2)
=
=
=
(3)
=
=
|