tính: a) 69.24-69.47-69/5.45+5 b) 12.45-12.57-36/42.8-21 02/10/2021 Bởi Peyton tính: a) 69.24-69.47-69/5.45+5 b) 12.45-12.57-36/42.8-21
BL a)$\frac{69.24−69.47−69}{5.45+5}$ =$\frac{69.(24−47−1)}{5.(45+1)}$ =$\frac{69.(−24)}{5.46}$ =−$\frac{36}{5}$ 365 b) $\frac{12.45−12.57−36}{42.8 −21}$ = $\frac{12.45 − 12.57 − 12.3}{21.2.8−21}$=$\frac{12. ( 45 − 57 − 3)}{21. ( 2.8 − 1 )}$ =$\frac{12. ( − 15 )}{21.15}$ =−$\frac{4}{7}$ Xin 1 cảm ơn và vote 5s! ~Chúc bn học tốt~ Bình luận
Đáp án+Giải thích các bước giải: $a)\dfrac{69.24-69.47-69}{5.45+5}\\=\dfrac{69.(24-47-1)}{5.(45+1)}\\=\dfrac{69.(-24)}{5.46}\\=-\dfrac{36}{5}$ $b)\dfrac{12.45-12.57-36}{42.8-21}\\=\dfrac{12.45-12.57-12.3}{21.2.8-21}\\=\dfrac{12.(45-57-3)}{21.(2.8-1)}\\=\dfrac{12.(-15)}{21.15}\\=-\dfrac{4}{7}$ Bình luận
BL
a)$\frac{69.24−69.47−69}{5.45+5}$ =$\frac{69.(24−47−1)}{5.(45+1)}$ =$\frac{69.(−24)}{5.46}$ =−$\frac{36}{5}$ 365
b) $\frac{12.45−12.57−36}{42.8 −21}$ = $\frac{12.45 − 12.57 − 12.3}{21.2.8−21}$=$\frac{12. ( 45 − 57 − 3)}{21. ( 2.8 − 1 )}$ =$\frac{12. ( − 15 )}{21.15}$ =−$\frac{4}{7}$
Xin 1 cảm ơn và vote 5s! ~Chúc bn học tốt~
Đáp án+Giải thích các bước giải:
$a)\dfrac{69.24-69.47-69}{5.45+5}\\=\dfrac{69.(24-47-1)}{5.(45+1)}\\=\dfrac{69.(-24)}{5.46}\\=-\dfrac{36}{5}$
$b)\dfrac{12.45-12.57-36}{42.8-21}\\=\dfrac{12.45-12.57-12.3}{21.2.8-21}\\=\dfrac{12.(45-57-3)}{21.(2.8-1)}\\=\dfrac{12.(-15)}{21.15}\\=-\dfrac{4}{7}$