解:简便运高耐算灶念帆如隐雹下:
87-17+15-33
=87-(17+33)+10+5
=87-50+10+3+2
=37+10+3+2
=47+3+2
=52
87-17+15-33
=87-(17+33)+15
=87-50+15
=37+15
=52。
原式=87+15-(17+33)
=102-50
=52.
=87+15-(17+33)
=87+15-50
=87-50+15
=37+15
=52
87-17+15-33
=87+15-(17+33)
=102-50
=52