Toán (7/30×12/37+12/30×23/37)x13/31-(-25)/37×18/31 Giúp mình nhanh lên ạ 19/09/2021 By Kaylee (7/30×12/37+12/30×23/37)x13/31-(-25)/37×18/31 Giúp mình nhanh lên ạ
Đáp án: $\dfrac{606}{1147}$ Giải thích các bước giải: $\left (\dfrac{7}{30}.\dfrac{12}{37}+\dfrac{12}{30}.\dfrac{23}{37} \right ).\dfrac{13}{31}-\dfrac{-25}{37}.\dfrac{18}{31}\\=\dfrac{12}{30}.\left (\dfrac{7}{37}+\dfrac{23}{37} \right ).\dfrac{13}{31}-\dfrac{-25}{37}.\dfrac{18}{31}\\=\dfrac{12}{30}.\dfrac{13}{31}.\dfrac{30}{37}+\dfrac{25}{37}.\dfrac{18}{31}\\=\dfrac{12.13}{31.37}+\dfrac{25.18}{37.31}\\=\dfrac{1}{31.37}.(12.13+25.18)\\=\dfrac{606}{1147}$ Trả lời
Đáp án:
$\dfrac{606}{1147}$
Giải thích các bước giải:
$\left (\dfrac{7}{30}.\dfrac{12}{37}+\dfrac{12}{30}.\dfrac{23}{37} \right ).\dfrac{13}{31}-\dfrac{-25}{37}.\dfrac{18}{31}\\
=\dfrac{12}{30}.\left (\dfrac{7}{37}+\dfrac{23}{37} \right ).\dfrac{13}{31}-\dfrac{-25}{37}.\dfrac{18}{31}\\
=\dfrac{12}{30}.\dfrac{13}{31}.\dfrac{30}{37}+\dfrac{25}{37}.\dfrac{18}{31}\\
=\dfrac{12.13}{31.37}+\dfrac{25.18}{37.31}\\
=\dfrac{1}{31.37}.(12.13+25.18)\\
=\dfrac{606}{1147}$
Còn phép tính cuối mik không biết giải