(-3/4)* 3/4 + 9/16 *(-15) (用简便方法计算)

问题描述:

(-3/4)* 3/4 + 9/16 *(-15) (用简便方法计算)

原式=-9/16 +9/16 *(-15)
=9/16*(-1)+9/16 *(-15)
=9/16*[(-1)+(-15)]
=9/16*(-16)
=-9