27乘以3.4加15.4乘以34减340乘以百分之81,怎么简算.

问题描述:

27乘以3.4加15.4乘以34减340乘以百分之81,怎么简算.

27乘以3.4加15.4乘以34减340乘以百分之81
=27x3.4+154x3.4-3.4x81
=3.4x(27+154-81)
=3.4x100
=340