问题
解答题
细心算一算. (1)|-2.7|+(-3.5); (2)
(3)(
(4)-59
|
答案
(1)|-2.7|+(-3.5)
=2.7-3.5
=-(3.5-2.7)
=-0.8;
(2)
×(-7.2)÷(-21 9
)2 5
=(-
)×(-4 5
)5 12
=
;1 3
(3)原式=
×(-4 9
)-3 2
×(-2 3
)4 9
=-
+2 3 8 27
=-(
-2 3
)8 27
=-
;10 27
(4)-59
×3215 16
=(
-60)×321 16
=
×32-60×321 16
=2-1920
=-
=-1918.