\(=\dfrac{\left(253+1\right).399-145}{254+399.253}\)
\(=\dfrac{253.399+399-145}{254+399.253}\)
=\(\dfrac{399.253+254}{254+399.253}=1\)
ôi mình ghi sai đề
\(\dfrac{254.399-145}{\text{254+399.253}}\)
\(=\dfrac{\left(253+1\right).399-145}{254+399.253}\)
\(=\dfrac{253.399+399-145}{254+399.253}\)
=\(\dfrac{399.253+254}{254+399.253}=1\)
ôi mình ghi sai đề
\(\dfrac{254.399-145}{\text{254+399.253}}\)
\(\dfrac{254.399-145}{254+399.253}\)
1.Tính
x-6=11
\(\dfrac{254.399-145}{254+399.253}\)
(2545 + 2546) : (2543 x 2542)
( 2545 + 2546 ) : ( 2543 x 2542 )
Tính nhanh:
3) 23 . ( 145 - 17) - 145 . ( 23 - 6)
1.Tính giá trị biểu thức sau
a) 7438 - 64092 : 654 + 149 x 78
b) 37 x ( 8767 - 9996 : 12 ) + 6442
c) 33 + 43 + 53 - 63
d) ( 2545 + 2546 ) : ( 2543 x 2542)
2. Tìm x biết
a) 264 + 12 x = 1800
b) ( x + 73 ) : 19 = 321
c) 2x + 3x + 4x = 18
d) 10 < 2 x < 20 ( x thuộc N )
tính nâng cao
1) \(\left(1-\frac{1}{2}\right)x\left(1-\frac{1}{3}\right)x\left(1-\frac{1}{4}\right).............\)
2) \(5\frac{9}{10}:\frac{3}{2}-\left(2\frac{1}{3}x4\frac{1}{2}-2x2\frac{1}{3}\right):\frac{7}{4}\)
3) \(254x399-145\)
4) \(254+399x255\)
5) \(638+780x5-369:9\)
6) \(\left(275+485\right)x16-483:3x4\)
7 ) \(\frac{13}{15}+\frac{4}{7}-\frac{101}{105}\)
145-(x+26)=97
Tính hợp lí:
23.(145-17)-145.(23-6)
Viết cách làm giùm mình nha