摘要:= x:=:21.5:3=x:18 0.4:x=0.5:0.6
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计算:
(1)(-5)-(+3)+(-9)-(-7)+
;
(2)10-23+32-17-21+45;
(3)(-3
)+(+2
)-(+2
)-(-7
);
(4)-9.2-(7.1)-(-3)+6
+(+2.9);
(5)3.6+41.8-12
-11-51
;
(6)-
-
-
+2
-
-
.
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(1)(-5)-(+3)+(-9)-(-7)+
| 1 |
| 2 |
(2)10-23+32-17-21+45;
(3)(-3
| 5 |
| 6 |
| 2 |
| 5 |
| 1 |
| 6 |
| 3 |
| 5 |
(4)-9.2-(7.1)-(-3)+6
| 1 |
| 5 |
(5)3.6+41.8-12
| 3 |
| 5 |
| 4 |
| 5 |
(6)-
| 1 |
| 8 |
| 2 |
| 5 |
| 4 |
| 9 |
| 3 |
| 8 |
| 3 |
| 5 |
| 5 |
| 9 |