(十五分之一加四十九分之三)乘15减45除以49

问题描述:

(十五分之一加四十九分之三)乘15减45除以49

(十五分之一加四十九分之三)乘15减45除以49
=(1/15+3/49)×15-45×1/49
=1/15×15+3/49×15-45/49
=1+45/49-45/49
=1+0
=1

(十五分之一加四十九分之三)乘15减45除以49
=1/15*15+(3/49*15-45*1/49)
=1+1/49*(15*3-45)
=1+0
=1

=1/15×15+3/49×15-45×1/49
=1+(1/49×45-45×1/49)
=1+0
=1

答案为1括号内不要相加用分配法出来以抵消就可以了 =1/15×15+3/49×15-45×1/49
=1+(1/49×45-45×1/49)
=1+0
=1