12×(5×7)=(12*5)*7=60*7=420
(29×2)×5=29*(2*5)=29*10=290
(9×4)×25=9*(4*25) =9*100=900
(17×4)×10=68*10=680
15×(4×9)=(15*4)*9=60*9=540
10×(29×2)=10*58=580
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12×(5×7)=(12*5)*7=60*7=420
(29×2)×5=29*(2*5)=29*10=290
(9×4)×25=9*(4*25) =9*100=900
(17×4)×10=68*10=680
15×(4×9)=(15*4)*9=60*9=540
10×(29×2)=10*58=580