Question

69×55+59×26-31×69的简便运算？

Answer 1

原式＝69×（55一31）＋59×26
＝69x24＋59x26

Answer 2

69ⅹ55+59x26一31x69
=69x55+(69一10)ⅹ26一31ⅹ69
=69ⅹ55+69x26一10ⅹ26
一31x69
=69x(55+26一31)一10x26
=69x50一260
=3450一260
=3190。

Answer 3

69×55＋59×26－31×69
＝69×（55一31）＋59×26
＝69×24＋59×26
＝59×24＋10×24＋59×26
＝59×（24＋26）＋240
＝59×50＋240
＝60×50一1×50＋240
＝300一50十240
＝250十240
＝490

Answer 4

69×55+59×26－31×69 ＝69×55－31×69+59×26 ＝69×（55－31）+59×26 ＝69×24+59×26 ＝1656+1434 ＝3090

Answer 5

=69(55-31)+59x26
=69x24+69x26-260
=69(24+26)-260
=69x50-260
=6900/2-260
=3190