问题
解答题
计算题(每小题3分,满分24分,要求写出计算过程.) ①(+8)-(-5)+(-9)-(+13); ②(-1
③0-(-
④(-
⑤2
⑥
⑦-0.85×
⑧|
|
答案
①原式=8+5-9-13
=-9;
②原式=-
-3.2+1.88 5
=-1.6-3.2+1.8
=-3;
③原式=
-1 3
+3 4
-2 3 5 6
=(
+1 3
)-(2 3
+3 4
)5 6
=1-19 12
=-
;7 12
④原式=(-
)×(-24)+3 4
×(-24)-2 3
×(-24)1 12
=18-16+2
=4;
⑤原式=
-19 8
+47 9
-59 8 16 9
=(
+19 8
)-(59 8
+47 9
)16 9
=
-778 8
=
;11 4
⑥原式=
×[-9-11+10]5 13
=
×(-10)5 13
-
;50 13
⑦原式=-0.85×
+4-6+0.85×8 17 8 17
=-2;
⑧原式=
-4 7
-(2 5
-7 9
)+(2 5
-4 7
)2 9
=
-4 7
-2 5
+7 9
+2 5
-4 7 2 9
=(
+4 7
)-(4 7
+7 9
)2 9
=
-18 7
=
.1 7