\(\dfrac{2}{5}-\dfrac{3}{20}=\dfrac{8}{20}-\dfrac{3}{20}=\dfrac{5}{20}=\dfrac{1}{4}=0,25\)
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Voi 3 chu so 3;4;5
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d)chia het cho9
( ghi them loi giai)
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ghi them loi giai
Vẽ thêm sơ đo!!
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1/2+2/4+3/6+4/8+5/10+6/12+7/14+8/16+9/18+10/20=?
phai co loi giai nhe!