75×﹙8+4﹚
=75×8﹢75×4
=600﹢300
=900
88×125
=11×﹙8×125﹚
=11×1000
=11000
125×（80+4）
=125×80﹢125×4
=10000﹢500
=10500
72×75
=9×﹙8×75﹚
=9×600
=5400
135×17-35×17
=﹙135-35﹚×17
=100×17
=1700
795-(95-425)
=795-95+425
=700+425
=1125
646-(138+146)
=646-146-138
=500-138
=362
99×15
=90×15+9×15
=1350+135
=1485
102×23
=100×23+2×23
=2300+46
=2346
39×4×125
=39×﹙4×125﹚
=39×500
=19500
75×19×8
=75×8×19
=600×19
=11400