15.6×13.1-156+1.56×69简便计算
解:采用分配律,
原式=15.6×13.1-156+1.56×69
=1.56×131-156+1.56×69
=1.56x(131+69)-156
=1.56x200-156
=156x2-156
=156
15.6×13.1-156+1.56×69
=15.6×13.1+15.6×6.9-156
=15.6×(13.1+6.9)-156
=15.6×20-156
=156×2-156
=156
=15.6×13.1-15.6×10+15.6×6.9
=15.6×(13.1-10+6.9)
=15.6×10
=156
156
解析:
15.6×13.1-156+1.56×69
=15.6×13.1-15.6×10+15.6×6.9
=15.6×(13.1-10+6.9)
=15.6×[(13.1+6.9)-10]
=15.6×(20-10)
=15.6×10
=156