12345×99+12345×9999-98×1234简便计算怎么算?
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解:
原式=12345×99+12345×9999-98×1234
=12345×(98+1)+12345×9999-98×1234
=12345×98+12345+12345×9999-98×1234
=98×(12345-1234)+12345×(1+9999)
=98×11111+123450000
=(100-2)×11111+123450000
=1111100-22222+123450000
=1111100+1234277778
=1235388878
原式=12345×99+12345×9999-98×1234
=12345×(98+1)+12345×9999-98×1234
=12345×98+12345+12345×9999-98×1234
=98×(12345-1234)+12345×(1+9999)
=98×11111+123450000
=(100-2)×11111+123450000
=1111100-22222+123450000
=1111100+1234277778
=1235388878
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原式=12345*10100-2*12345-98*12345
=12345*10100-(12345*100)
=12345*10000
=123450000
=12345*10100-(12345*100)
=12345*10000
=123450000
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12345X99+12345X9999-98X1234
=12345X(99+9999)-1234X98
=12345X10098-1234X98
=12345X(10000+98)-1234X98
=123450000+12345X98-1234X98
=123450000+98X(12345-1234)
=123450000+98X11111
=123450000+1088878
=124538878
=12345X(99+9999)-1234X98
=12345X10098-1234X98
=12345X(10000+98)-1234X98
=123450000+12345X98-1234X98
=123450000+98X(12345-1234)
=123450000+98X11111
=123450000+1088878
=124538878
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