简便计算342*15-34*5怎么做
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简便计算342*15-34*5怎么做
简便计算342*15-34*5怎么做
简便计算342*15-34*5怎么做
342x15-34x5
=342x3x5-34x5
=(1026-34)x5
=992x5
=(1000-8)x5
=1000x5-8x5
=5000-40
4960
342*15-34*5
=342*10+342*5-34*5
=3420+308*5
=3420+300*5+8*5
=3420+1500+40
=4960