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2023-05-04 20:43:44
gọi 2 lớp 7A và 7B là x,y biết 7A và 7b đã quyên góp được 121 quyển sách
ta có: x/5 = y/6 và x + y = 121
áp dụng tính chất bằng nhau ta có
x/5=y/6=x+y/5+6= 121/11= 11
x= 11*5= 55
y= 11*6=66
vậy lớp 7a quyên góp 55 quyển sách
lớp 7b quyên góp 66 quyển sách