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计算下面各题(能简算的要简算):(1)2.6×3.5+2.6×5.5+2.6(2)(25+14)÷23(3)113÷839+911×1112(4)78×10.1.
题目详情
计算下面各题(能简算的要简算):
(1)2.6×3.5+2.6×5.5+2.6
(2)(
+
)÷
(3)
÷
+
×
(4)78×10.1.
(1)2.6×3.5+2.6×5.5+2.6
(2)(
2 |
5 |
1 |
4 |
2 |
3 |
(3)
1 |
13 |
8 |
39 |
9 |
11 |
11 |
12 |
(4)78×10.1.
▼优质解答
答案和解析
(1)2.6×3.5+2.6×5.5+2.6
=2.6×(3.5+5.5+1)
=2.6×10
=26;
(2)(
+
)÷
=
×
=
;
(3)
÷
+
×
=
+
=
;
(4)78×10.1.
=78×(10+0.1)
=78×10+78×0.1
=780+7.8
=787.8.
=2.6×(3.5+5.5+1)
=2.6×10
=26;
(2)(
2 |
5 |
1 |
4 |
2 |
3 |
=
13 |
20 |
3 |
2 |
=
39 |
40 |
(3)
1 |
13 |
8 |
39 |
9 |
11 |
11 |
12 |
=
3 |
8 |
3 |
4 |
=
9 |
8 |
(4)78×10.1.
=78×(10+0.1)
=78×10+78×0.1
=780+7.8
=787.8.
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