29x39+39+20x39简便计算

39x29十39 =39x(29十1) =39x30 =30x(40-1) =1200-30 =1170

61x39+39*39=(61+39)x39=100*39=3900

=39*(76+24)=39*100=3900

39+39+39=39*3=【40-1】*3=120-3=117 满意采纳

79x39+24x39=(79+24)x39=(100+3)x39=100x39+3x39=3900+117=4017

72x39+39=72*(40-1)+39=2880-72+39=2880-33=2847

61x39 39 39简便计算61x39 39 39=39*(61+39)=39*100=3900

45x39+54x39+39用简便方式计算=39*(45+54+1)=39*100=3900

47x39-39x38+39=39x(47-38+1)=39x10=390

29X39+39X20X39=39X(29+780)=39X809=39X800+39X9=31200+351=31551

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