问题
解答题
计算: (1)4-(-4)+(-3); (2)-7
(3)-14-[3-(-2)3]; (4)(-
(5)-2×(-2
(6)4
|
答案
(1)4-(-4)+(-3)
=4+4-3
=5;
(2)-7
+5+21 3 1 3
=-7
+21 3
+51 3
=-5+5
=0;
(3)-14-[3-(-2)3]
=-1-[3+8]
=-1-11
=-12;
(4)(-
)×3÷(-3)×(-1 3
)1 3
=-(
×1 3
)×(3÷3)1 3
=-
×11 9
=-
;1 9
(5)-2×(-2
)+(-7)×21 6
+5×1 6 13 6
=(2-7+5)×21 6
=0×21 6
=0;
(6)4
×[-32×(-1 2
)2-0.8]÷(-21 3
)1 4
=4
×[-9×1 2
-0.8]×(-1 9
)4 9
=4
×[-1-0.8]×(-1 2
)4 9
=
×(-9 2
)×(-9 5
)4 9
=
.18 5