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1444减102加556减898减(15乘15加15乘5乘7)等于?还要用简算
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1444减102加556减898减(15乘15加15乘5乘7)等于?还要用简算
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答案和解析
1444-102+556-898-(15*15+15*5*7)
=(1444+556)-(102+898)-15*(15+5*7)
=2000-1000-15*50
=1000-750
=250
=(1444+556)-(102+898)-15*(15+5*7)
=2000-1000-15*50
=1000-750
=250
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