问题
解答题
计算: (1)-3-[-5+(1-0.2×
(2)[-3+(-5+|-4|)×(-
|
答案
(1)原式=-3-[-5+(1-
)×(-3 25
)]1 2
=-3-[-5+
×(-22 25
)]1 2
=-3-(-5-
)11 25
=-3+5+11 25
=2
;11 25
(2)原式=[-3+(-5+4)×(-
)]×3 2
÷(-3 2
)27 8
=(-3+
)×3 2
×(-3 2
)8 27
=-
×3 2
×(-3 2
)8 27
=
.2 3