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用简便方法计算下面各题:81723+514-61723+0.75;334×8-334+3×3.75;3.07-(3.07-1.8);934+9934+99934+999934.
题目详情
用简便方法计算下面各题:
8
+5
-6
+0.75;
3
×8-3
+3×3.75;
3.07-(3.07-1.8);
9
+99
+999
+9999
.
8
17 |
23 |
1 |
4 |
17 |
23 |
3
3 |
4 |
3 |
4 |
3.07-(3.07-1.8);
9
3 |
4 |
3 |
4 |
3 |
4 |
3 |
4 |
▼优质解答
答案和解析
(1)8
+5
-6
+0.75
=(8
-6
)+(0.75+5
)
=2+6
=8;
(2)3
×8-3
+3×3.75
=(8-1+3)×3.75
=10×3.75
=37.5;
(3)3.07-(3.07-1.8)
=3.07-3.07+1.8
=0+1.8
=1.8;
(4)9
+99
+999
+9999
=9+
+99+
+999+
+9999+
=9+99+999+9999+
+
+
+
=(10-1+100-+1000-1+10000-1)+(
×4)
=(11110-4)+3
=11109.
17 |
23 |
1 |
4 |
17 |
23 |
=(8
17 |
23 |
17 |
23 |
1 |
4 |
=2+6
=8;
(2)3
3 |
4 |
3 |
4 |
=(8-1+3)×3.75
=10×3.75
=37.5;
(3)3.07-(3.07-1.8)
=3.07-3.07+1.8
=0+1.8
=1.8;
(4)9
3 |
4 |
3 |
4 |
3 |
4 |
3 |
4 |
=9+
3 |
4 |
3 |
4 |
3 |
4 |
3 |
4 |
=9+99+999+9999+
3 |
4 |
3 |
4 |
3 |
4 |
3 |
4 |
=(10-1+100-+1000-1+10000-1)+(
3 |
4 |
=(11110-4)+3
=11109.
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