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面積 = (a + b)(c + d)二項式相乘abcdabcd 面積 = (a + b)(c + d)(a + b)(c + d)= (a + b)c二項式相乘abcd 面積 = (a + b)(c + d)(a + b)(c + d)= (a + b)c + (a + b)d二項式相乘abcd 面積 = (a + b)(c + d)(a + b)(c + d)= (a + b)c + (a + b)d二項式相乘= acacabcd 面積 = (a + b)(c + d)(a + b)(c + d)= (a + b)c + (a + b)d二項式相乘= ac + bcbcacabcd 面積 = (a + b)(c + d)(a + b)(c + d)= (a + b)c + (a + b)d二項式相乘= ac + bcbcac+ adadabcd 面積 = (a + b)(c + d)(a + b)(c + d)= (a + b)c + (a + b)d二項式相乘= ac + bcbcac+ adad+ bdbdabcd 面積 = (a + b)(c + d)(a + b)(c + d)= (a + b)c + (a + b)d二項式相乘bcacad= ac + bc + ad + bdbd