(112)0-(1-0.5-2)÷(278)23的值为( ) A.-13 B.13 C.43 D.73
问题描述:
(1
)0-(1-0.5-2)÷(1 2
)27 8
的值为( )2 3
A. -
1 3
B.
1 3
C.
4 3
D.
7 3
答
原式=1-(1-
)÷(1 0.52
)3×3 2
2 3
=1-(1-
)÷(1 0.25
)23 2
=1-(1-4)×
4 9
=1-(-3)×
4 9
=1+
4 3
=
.7 3
故选:D.