问题
解答题
计算: (1)-3+5.3+7-5.3 (2)(-2)×
(3)-16-|-5|+2×(-
(4)(
(5)-
|
答案
(1)-3+5.3+7-5.3
=-8.3+12.3
=4;
(2)(-2)×
÷(-3 2
)×43 4
=2×
×3 2
×44 3
=16;
(3)-16-|-5|+2×(-
)21 2
=-1-5+2×1 4
=-1-5+1 2
=-5
;1 2
(4)(
-1 3
)÷(-1 4
)+(-3)3÷(-3)1 12
=﹙
-1 3
﹚×﹙-12﹚+﹙-3﹚21 4
=-4+3+9
=8;
(5)-
+1 2
÷[(-11 2
)3+(-1 2
)2]×|-2.52|-1 2 1 2
=-
+1 2
÷[-1 2
+27 8
]×1 4
-25 4 1 2
=-
+1 2
×﹙-1 2
﹚×8 25
-25 4 1 2
=-
-1-1 2 1 2
=-2.