巧算 99999*99999+19999951*34+51*27+49*6125*(56+72)*125415*1321*73+415*869/73234*123+123*123+123*643

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巧算99999*99999+19999951*34+51*27+49*6125*(56+72)*125415*1321*73+415*869/73234*123+123*123+123*643巧算99

巧算 99999*99999+19999951*34+51*27+49*6125*(56+72)*125415*1321*73+415*869/73234*123+123*123+123*643
巧算 99999*99999+199999
51*34+51*27+49*61
25*(56+72)*125
415*1321*73+415*869/73
234*123+123*123+123*643

巧算 99999*99999+19999951*34+51*27+49*6125*(56+72)*125415*1321*73+415*869/73234*123+123*123+123*643
99999×99999+199999
=(100000—1)²+(200000—1)
=(100000²—200000+1)+(200000—1)
=100000²
51×34+51×27+49×61
=51×(34+27)+49×61
=51×61+49×61
=61×(51+49)
=61×100
=6100
25×(56+72)×125
=25×(16×8)×125
=(25×16)×(8×125)
=200×1000
=200000
415×1321×73+415×869×1/73这题你确定题目没有打错?
234×123+123×123+123×643
=123×(234+123+643)
=123×1000
=123000