计算下面各题,怎样简便就怎样算,并写出必要的简算过程.(1)(0.43+0.77×2.1)÷2.3 (2)910_79
计算下面各题,怎样简便就怎样算,并写出必要的简算过程.(1)(0.43+0.77×2.1)÷2.3(2)910_79+110(3)1112+524_34(4)23+14_...
计算下面各题,怎样简便就怎样算,并写出必要的简算过程.(1)(0.43+0.77×2.1)÷2.3 (2)910_79+110(3)1112+524_34 (4)23+14_23_14.
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(1)(0.43+0.77×2.1)÷2.3
=(0.43+1.617)÷2.3
=2.047÷2.3
=0.89;
(2)
-
+
=
+
-
=1-
=
;
(3)
+
-
=
-
=
;
(4)
+
-
-
=(
-
)+(
-
)
=0+0
=0.
=(0.43+1.617)÷2.3
=2.047÷2.3
=0.89;
(2)
9 |
10 |
7 |
9 |
1 |
10 |
=
9 |
10 |
1 |
10 |
7 |
9 |
=1-
7 |
9 |
=
2 |
9 |
(3)
11 |
12 |
5 |
24 |
3 |
4 |
=
9 |
8 |
3 |
4 |
=
3 |
8 |
(4)
2 |
3 |
1 |
4 |
2 |
3 |
1 |
4 |
=(
2 |
3 |
2 |
3 |
1 |
4 |
1 |
4 |
=0+0
=0.
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