a) 776 / 1455 – 392 / 1470 b) -32 / 144 – 95 / 152 14/11/2021 Bởi Sadie a) 776 / 1455 – 392 / 1470 b) -32 / 144 – 95 / 152
Đáp án: a)$\dfrac{776}{1455}$ – $\dfrac{-392}{1470}$ = $\dfrac{8}{15}$ – $\dfrac{-4}{15}$ = $\dfrac{4}{15}$ b) $\dfrac{-32}{144}$ – $\dfrac{-95}{152}$ = $\dfrac{-2}{9}$ – $\dfrac{-5}{8}$ = $\dfrac{-2.8}{9.8}$ – $\dfrac{-5.9}{8.9}$ = $\dfrac{-16}{72}$ – $\dfrac{-45}{72}$ = $\dfrac{-61}{72}$ Giải thích các bước giải: Bình luận
Đáp án:
a)$\dfrac{776}{1455}$ – $\dfrac{-392}{1470}$
= $\dfrac{8}{15}$ – $\dfrac{-4}{15}$
= $\dfrac{4}{15}$
b) $\dfrac{-32}{144}$ – $\dfrac{-95}{152}$
= $\dfrac{-2}{9}$ – $\dfrac{-5}{8}$
= $\dfrac{-2.8}{9.8}$ – $\dfrac{-5.9}{8.9}$
= $\dfrac{-16}{72}$ – $\dfrac{-45}{72}$
= $\dfrac{-61}{72}$
Giải thích các bước giải: