问题
解答题
计算: (1)1.78+3.64-5.25-0.2+0.3-0.33. (2)1-
(3)(-
(4)-102-[(1-
(5)-2-{8+(-1)2-[(-4)×2÷(-2)+
(6)
|
答案
(1)原式=5.42-5.25-0.2+0.3-0.33,
=0.17-0.2+0.3-0.33,
=-0.03+0.3-0.33,
=0.27-0.33,
=-0.06;
(2)原式=-
+9 14
+1-31 14
+6 7
-8 21
,17 35
=-
-8 14
+20 7
-8 21
,7 35
=-
+24 7
-8 21
,7 35
=-
-64 21
,7 35
=-
-64×5 21×5
,7×3 35×3
=-
-320 105
,21 105
=-
;341 105
(3)原式=(-
)÷(-1 6
)×7 12
+(-1)100,7 2
=
×1 6
×12 7
+1,7 2
=1+1,
=2;
(4)原式=-102-[
×1 2
][2-32],1 3
=-100-
×(2-9),1 6
=-100-
×(-7),1 6
=-100+
,7 6
=-98
;5 6
(5)原式=-2-{8+1-[-8÷(-2)-
×6]},5 6
=-2-{9+1},
=-2-10,
=-12;
(6)原式=
+|-1 -0.09
-1 25
|÷1 4
-|-5|-1 25
,1 0.2
=-
+100 9
×25-5-5,29 100
=-
+100 9
-10,29 4
=-
,400-29×9+360 36
=-
.499 36