问题
解答题
计算 (1)(-3.6)+(+2.5) (2)3-2×(-5)2 (3)-24×(-
(4)
(5)-14-(
(6)5×(-6)-(-4)2÷(-8) (7)-7.2-0.9-5.6+1.7 (8)(-1
|
答案
(1)(-3.6)+(+2.5)=-1.1;
(2)3-2×(-5)2
=3-2×25
=3-50
=-47;
(3)-24×(-
+5 6
-3 8
)1 12
=24×
-24×5 6
+24×3 8 1 12
=20-9+2
=13;
(4)
+(-1 2
)+2 3
+(-4 5
)+(-1 2
)1 3
=(
-1 2
)+(-1 2
-2 3
)+1 3 4 5
=0-1+4 5
=-
;1 5
(5)-14-(
-13 14
)×[4-(-2)2]11 12
=-1-(
-13 14
)×[4-4]11 12
=-1-(
-13 14
)×011 12
=-1-0
=-1;
(6)5×(-6)-(-4)2÷(-8)
=-30-16÷(-8)
=-30+2
=-28;
(7)-7.2-0.9-5.6+1.7
=-13.7+1.7
=-12;
(8)(-1
)+(-3.2)+|-1.8|3 5
=-1.6-3.2+1.8
=-4.8+1.8
=-3.