a (3-2/3+2/5)-(2+1/3-2/5
b 1/2+1/6+1/12+1/20+1/30+1/42+1/526+1/72+1/90
a (3-2/3+2/5)-(2+1/3-2/5 b 1/2+1/6+1/12+1/20+1/30+1/42+1/526+1/72+1/90
By Eloise
By Eloise
a (3-2/3+2/5)-(2+1/3-2/5
b 1/2+1/6+1/12+1/20+1/30+1/42+1/526+1/72+1/90
Đáp án:
Giải thích các bước giải:
a)= (3-2/3+2/5)-(2+1/3-2/5)
= 3-2/3+2/5-2-1/3+2/5
=1-1+4/5
=4/5
b)=