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简介:
1)67×21+18×21+85×79
=21×(67+18)+85×79
=21×85+85×79
=85×(21+79)
=8500
2)654321×909090+654321×90909
=654321×999999
=654321×(100000-1)
=654321000000-654321
=654320345679
3)599996+49997+3998+407+89
=600000+50000+4000-4-3-2+407+89
=65400+487
=65887
4)(48×75×81)÷(24×25×27)
=48×75×81÷24÷25÷27
=48÷24×75÷25×81÷27
=2×3×3
=18