计算(1+12+14)×(12+14+16)-(1+12+14+16)×(12+14)-数学

题目简介

计算(1+12+14)×(12+14+16)-(1+12+14+16)×(12+14)-数学

题目详情

计算(1+
1
2
+
1
4
)×(
1
2
+
1
4
+
1
6
)-(1+
1
2
+
1
4
+
1
6
)×(
1
2
+
1
4
题型:解答题难度:中档来源:不详

答案

class="stub"1
2
+class="stub"1
4
=a,class="stub"1
2
+class="stub"1
4
+class="stub"1
6
=b,则:
(1+class="stub"1
2
+class="stub"1
4
)×(class="stub"1
2
+class="stub"1
4
+class="stub"1
6
)-(1+class="stub"1
2
+class="stub"1
4
+class="stub"1
6
)×(class="stub"1
2
+class="stub"1
4
),
=(1+a)×b-(1+b)×a,
=b+ab-a-ab,
=b-a,
=(class="stub"1
2
+class="stub"1
4
+class="stub"1
6
)-(class="stub"1
2
+class="stub"1
4
),
=class="stub"1
6

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