1.1×4又21⼀97+40.9÷5又2⼀19-4.09×9⼀97

2025-03-11 04:38:49
推荐回答(1个)
回答1:

原式=11/10*409/97+409/10*19/97-409/100*9/97
=(11*10*409+409*10*19-409*9)/(97*100)
=409*(110+190-9)/9700
=409*291/9700
=12.27