简便计算题~~~~~~~~~

35×14=35×2×7=70×7=490
630÷42=630÷7÷6=90÷6=15
102×26=(100+2)×26=100×26+2×26=2652
74×9.9=74×(10-0.1)=74×10-74×0.1=732.6
15÷0.125=15×8÷8÷0.125=(15×8)÷(8×0.125)=120

35*14=35*2*7=70*7=490
630/42=(7*90)/(7*6)=(15*6)/6=15
102*26=13*8*13*2=2652
74*9.9=74*(10-0.1)=740-7.4=732.6
15/0.125=15/(1/8)=15*8=15*2*4=120

35*14=7*7*5*2=490
7*90÷7÷6=15
102*26=100*26+2*26=2652
74*9.9=74*10-74*0.1=732.6
15÷0.125=15*8=120

35×14=7×5×2×7=7×7×5×2=49×10=490
630÷42=7×9×10÷(7×6)=7×3×3×10÷(7×3×2)=30÷2=15
102×26=(100+2)×26=100×26+2×26=2600+52=2652
74×9.9=74×(10-0.1)=74×10-74×0.1=740-7.4=732.6
15÷0.125=15÷八分之一=15×8=120