题目内容
计算:(能简便计算用简便方法)
(1)(-20)+(+3)-(-5)-(+7);
(2)|
-
|+|
-
|+|
-
|-|
-
|;
(3)(-5)×6+(-125)÷(-5);
(4)3
+(-
)-(-
)+2
;
(5)(
-
-
+
)×4;
(6)-18÷(-3)2+5×(-
)3-(-15)÷5.
(1)(-20)+(+3)-(-5)-(+7);
(2)|
1 |
6 |
1 |
7 |
1 |
7 |
1 |
8 |
1 |
8 |
1 |
9 |
1 |
9 |
1 |
10 |
(3)(-5)×6+(-125)÷(-5);
(4)3
1 |
2 |
1 |
2 |
1 |
3 |
2 |
3 |
(5)(
2 |
3 |
1 |
4 |
3 |
8 |
5 |
24 |
(6)-18÷(-3)2+5×(-
1 |
2 |
①原式=(-20)+(+3)+(+5)+(-7)=[(+3)+(+5)]+[(-20)+(-7)]=8+(-27)=-19;
②原式=
-
+
-
+
-
-
+
=
-
-
+
=(
+
)+[(-
)+(-
)]=
+(-
)=
;
③原式=-30+25=-5;
④原式=3
+(-
)+
+2
=3+3=6;
⑤原式=
×4-
×4-
×4+
×4=
-1-
+
=1;
⑥原式=-18÷9-
+3=-2+3-
=
.
②原式=
1 |
6 |
1 |
7 |
1 |
7 |
1 |
8 |
1 |
8 |
1 |
9 |
1 |
9 |
1 |
10 |
1 |
6 |
1 |
9 |
1 |
9 |
1 |
10 |
1 |
6 |
1 |
10 |
1 |
9 |
1 |
9 |
8 |
30 |
2 |
9 |
2 |
45 |
③原式=-30+25=-5;
④原式=3
1 |
2 |
1 |
2 |
1 |
3 |
2 |
3 |
⑤原式=
2 |
3 |
1 |
4 |
3 |
8 |
5 |
24 |
8 |
3 |
3 |
2 |
5 |
6 |
⑥原式=-18÷9-
5 |
8 |
5 |
8 |
3 |
8 |
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