Đáp án:
\(\bigg(-\dfrac34+\dfrac25\bigg):\dfrac37+\bigg(\dfrac35+\dfrac{-1}{4}\bigg):\dfrac37=0\)
Giải thích các bước giải:
\(\bigg(-\dfrac34+\dfrac25\bigg):\dfrac37+\bigg(\dfrac35+\dfrac{-1}{4}\bigg):\dfrac37\\ =\bigg(-\dfrac34+\dfrac25\bigg)\times \dfrac73+\bigg(\dfrac35+\dfrac{-1}{4}\bigg)\times \dfrac73\\ =\dfrac73\times \bigg(-\dfrac34+\dfrac25+\dfrac35-\dfrac14\bigg)\\ =\dfrac73\times \bigg[\bigg(-\dfrac34-\dfrac14\bigg)+\bigg(\dfrac25+\dfrac35\bigg)\bigg]\\ =\dfrac73\times (-1+1)\\ =\dfrac73\times 0=0\)
chúc em học tốt!
