题目内容
计算(1
+2
+3
+4
)÷(3
+5
+7
+9
)=______．
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（1
+2
+3
+4
）÷（3
+5
+7
+9
），
=（
+
+
）÷（
×2+
×2+
×2），
=（
+
+
）÷[（
+
+
）×2]，
=（
+
+
）÷（
+
+
）÷2，，
=1÷2，
=
．
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=（
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=（
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=（
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=1÷2，
=
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