
计算下面各题,能简算的要简算,并写出主要的计算过程.①7.8-8.75+2.2-1.25 &nb...
计算下面各题,能简算的要简算,并写出主要的计算过程.①7.8-8.75+2.2-1.25②13.2÷(9.4-5)+5.32③7-37-47④1317-(517+110)...
计算下面各题,能简算的要简算,并写出主要的计算过程.①7.8-8.75+2.2-1.25 ②13.2÷(9.4-5)+5.32③7-37-47④1317-(517+110) ⑤15+(56-1318)
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①7.8-8.75+2.2-1.25
=(7.8+2.2)-(8.75+1.25)
=10-10
=0
②13.2÷(9.4-5)+5.32
=13.2÷4.4+5.32
=3+5.32
=8.32
③7-
-
=7-(
+
)
=7-1
=6
④
-(
+
)
=
-
-
=
-
=
⑤
+(
-
)
=
+(
-
)
=
+
=
=(7.8+2.2)-(8.75+1.25)
=10-10
=0
②13.2÷(9.4-5)+5.32
=13.2÷4.4+5.32
=3+5.32
=8.32
③7-
3 |
7 |
4 |
7 |
=7-(
3 |
7 |
4 |
7 |
=7-1
=6
④
13 |
17 |
5 |
17 |
1 |
10 |
=
13 |
17 |
5 |
17 |
1 |
10 |
=
8 |
17 |
1 |
10 |
=
63 |
170 |
⑤
1 |
5 |
5 |
6 |
13 |
18 |
=
1 |
5 |
15 |
18 |
13 |
18 |
=
1 |
5 |
1 |
9 |
=
14 |
45 |
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