简便计算 139*137/138+137*1/1/138
简便计算 139*137/138+137*1/1/138
日期:2022-03-18 23:51:34 人气:1
139*137/138+137*1/1/138
=139×137÷138+137÷138
=(139×137+137)÷138
=140×137÷138
=140×(138-1)÷138
=(140×138-140)÷138
=140-140÷138
=140-70/69
=1
=139×137÷138+137÷138
=(139×137+137)÷138
=140×137÷138
=140×(138-1)÷138
=(140×138-140)÷138
=140-140÷138
=140-70/69
=1