Tính a) [(3/7)^4 . (3/7)^5] : (3/7)^ 7; b) [(7/8)^5 : (7/8)^4] . 7/8
Giải thích
a) 374.375:377=374+5:377=379:377=379−7=372
b) 785:784.78=785−4.78=781.781=781+1=782
c) 0,63.0,68:0,67.0,62=0,63+8:0,67+2=0,611:0,69=0,611−9=0,62
a) 374.375:377=374+5:377=379:377=379−7=372
b) 785:784.78=785−4.78=781.781=781+1=782
c) 0,63.0,68:0,67.0,62=0,63+8:0,67+2=0,611:0,69=0,611−9=0,62