计算:(512+732+317)×(732+317+413)-(512+732+317+413)×(732+317)=______.-数学

题目简介

计算:(512+732+317)×(732+317+413)-(512+732+317+413)×(732+317)=______.-数学

题目详情

计算:(
5
12
+
7
32
+
3
17
)×(
7
32
+
3
17
+
4
13
)-(
5
12
+
7
32
+
3
17
+
4
13
)×(
7
32
+
3
17
)
=______.
题型:解答题难度:中档来源:不详

答案

a=class="stub"5
12
+class="stub"7
32
+class="stub"3
17
b=class="stub"7
32
+class="stub"3
17

则有:(class="stub"5
12
+class="stub"7
32
+class="stub"3
17
)×(class="stub"7
32
+class="stub"3
17
+class="stub"4
13
)-(class="stub"5
12
+class="stub"7
32
+class="stub"3
17
+class="stub"4
13
)×(class="stub"7
32
+class="stub"3
17
)

=a×(b+class="stub"4
13
)-(a+class="stub"4
13
)×b,
=class="stub"4
13
(a-b),
=class="stub"4
13
×(class="stub"5
12
+class="stub"7
32
+class="stub"3
17
-class="stub"7
32
-class="stub"3
17
),
=class="stub"4
13
×class="stub"5
12

=class="stub"5
39

故答案为:class="stub"5
39

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