79x0重点三码,7x90,
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发布时间:2024-10-06 22:18
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时间:2024-10-06 23:32
1、77.7x90+111x37
=(70+7+0.7)x90+(100+10+1)x37
=6300+630+63+3700+370+37
=11100
2、0.37x2400x0.25+3x8.75+2.825x30
=(0.37x3x800x0.25)+3x8.75+28.25x3
=(0.37x3x200)+3x(8.75+28.25)
=(37x3x2)+3x37
= 37x3x(2+1)
= 333
3、20.1x0.45
=(20+0.1)x0.45
= 9+0.045
= 9.045