Tính nhanh: 45316 × 27 – 24105 ……………………………. 45316 × 26 + 21211 09/09/2021 Bởi Parker Tính nhanh: 45316 × 27 – 24105 ……………………………. 45316 × 26 + 21211
MS = 45316 × 26 + 21211 = 45316 × (27 – 1) + 21211 = 45316 × 27 – 45316 x 1 + 21211 = 45316 × 27 – (45316 – 21211) = 45316 × 27 – 24105 =>$\dfrac{45316 × 27 – 24105}{45316 × 26 + 21211}$ = 45316 × 27 – 24105 / 45316 × 27 – 24105 = 1 Bình luận
Ta có: Tử số: $=45316\times27-24105$ $=45316\times(26+1)-24105$ $=45316\times26+45316\times1-24105$ $=45316\times26+45316-24105$$=45316\times26+21211$ $=$ Mẫu số Vậy $\dfrac{45316\times27-24105}{45316\times26+21211}=1$ Bình luận
MS = 45316 × 26 + 21211
= 45316 × (27 – 1) + 21211
= 45316 × 27 – 45316 x 1 + 21211
= 45316 × 27 – (45316 – 21211)
= 45316 × 27 – 24105
=>$\dfrac{45316 × 27 – 24105}{45316 × 26 + 21211}$
= 45316 × 27 – 24105 / 45316 × 27 – 24105
= 1
Ta có:
Tử số: $=45316\times27-24105$
$=45316\times(26+1)-24105$
$=45316\times26+45316\times1-24105$
$=45316\times26+45316-24105$
$=45316\times26+21211$
$=$ Mẫu số
Vậy $\dfrac{45316\times27-24105}{45316\times26+21211}=1$