解:15x4x25x6
=15x6x4x25
=90x100
=9000
126x99
=126x(100-1)
=12600-126
=12474
55x44
=(50+5)x(40+4)
=2000+200+200+20
=2420
490/14
=(420+70)/14
=30+5
=35
1、原式=15*6*4*25=90*100=9000
2、原式=126*100-126=12474
3、原式=7*70/14=35
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