999×21+666×45-333×53的简便运算方法

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999×21+666×45-333×53=333×63+333×90-333×53=333×(63+90-53)=333×100=33300...

千问 | 2012-4-10 12:22:42 | 显示全部楼层

333*63+333*90-333*53=333*（63+90-53）=333*100=3330...

千问 | 2012-4-10 12:22:42 | 显示全部楼层

333×(3×21+2×45-53)=333×(63+90-53)=333×100=33300...

千问 | 2012-4-10 12:22:42 | 显示全部楼层

999×21+666×45-333×53=333x(3x21+2x45-53)=333x(63+90-53)=333x100=33300...

千问 | 2012-4-10 12:22:42 | 显示全部楼层

999×21+666×45-333×53=333×3×21+333×2×45-333×53=333×(3×21+2×45-53)=333×(63+90-53)=333×(63-53+90)=333×1000=333000...

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