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6*29=(10-4)*29=10*29-4*29=290-116=174
3*29=(10-7)*29=10*29-7*29=290-203=87
39*4=(40-1)*4=40*4-1*4=160-4=156
49*5=(50-1)*5=50*5-1*5=20-5=245
98*5=(100-2)*5=100*5-2*5=500-10=490
6*29=(10-4)*29=10*29-4*29=290-116=174
3*29=(10-7)*29=10*29-7*29=290-203=87
39*4=(40-1)*4=40*4-1*4=160-4=156
49*5=(50-1)*5=50*5-1*5=20-5=245
98*5=(100-2)*5=100*5-2*5=500-10=490