用简便方法计算.75乘(8+4) 88乘125 125乘(80+4)72乘75 135乘17-35乘17 795-(95
1个回答

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