1/5x27+3/5x41
=3/5x9+3/5x41
=3/5x(9+41)
=3/5x50
=3x10
=30
答:答案是30。
(27+3*41)/5=(27+123)/5=30
1/5*27+3/5*41=1/5*(27+123)=30
1/5*27+3/5*41
=1/5*(30-3)+3/5*(40+1)
=1/5*30-1/5*3+3/5*40+3/5*1
=30/5-3/5+120/5+3/5
=30/5+120/5
=150/5
=30
1/5x27+3/5x41
=1/5x27+(1/5+1/5+1/5)x41
=1/5x27+1/5x41+1/5x41+1/5x41
=1/5x(27+41+41+41)
=1/5x150
=30