填空题 较易0.85 引用4 组卷191
我国宋代数学家杨辉所著《详解九章算法》中记载了用如图所示的三角形解释了二项式的乘方展开式中的系数规律，我们把这种数字三角形叫做“杨辉三角”，请你利用杨辉三角，计算
的展开式中，从左起第四项是____________ ．
···································1
································1 1
·······················1 2 1
··········1 3 3 1
··1 4 6 4 1
的展开式中，从左起第四项是 ···································1 ································1 1 ·······················1 2 1 ··········1 3 3 1 ··1 4 6 4 121-22七年级下·江苏连云港·阶段练习
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