99x35x35用简便方法应该这样计算:
99x35x35
=(100-1)x35x35
=100x35x35-35x35
=35x3500-35x35
=(40-5)x3500-(40-5)x35
=40x3500-5x3500-40x35+5x35
=140000-17500-1400+175
= 121275
原式=99x(30+5)x30+5)
=99x(30x30+2x30x5+5x5)
=99x(900+300+25)
=99x1225
=(100-1)x1225
=100x1225-1x1225
=122500-1225
=121275