156+78\1983+22\1985等于几

分类: 作业答案 • 2022-08-10 12:15:06

问题描述：

答

156+78X1983+22X1985 =156+78X1983+22X(1983+2) =156+78X1983+22X1983+22X2 =156+(78+22)X1983+44 =156+44+198300 =200+198300 =198500