kết quả = 257977.75

hok tốt nha !!

12.803,35

a,258-(122-(-358+322))

=258-(122+358-322)

=258-122-358+322

=(258-358)+(-122+322)

=-100+200=100

k cho tớ nhé ^^Tớ giải tiếp cho

Trả lời:

\(a,\)\(258-\left[122-\left(-358+322\right)\right]\)

\(=258-\left(122+358-322\right)\)

\(=258-122-358+322\)

\(=\left(258-358\right)-\left(122-322\right)\)

\(=\left(-100\right)-\left(-200\right)\)

\(=-100+200\)

\(=100\)

Hok tốt!

Vuong Dong Yet

hai số chẵn liên tiếp có hiệu là 2

số lớn là:

(694+2):2=348

số bé là:

348-2=346

Đáp số:SL:348

             SB:346

Số bé là

              (694-2):2 = 346

Số lớn là:

                 346+2 = 348

Ta có:

\(A=\frac{1}{358}.\left(7+\frac{1}{297}\right)-\left(4-\frac{1}{358}\right).2.\frac{1}{297}-7.\frac{1}{358}-\frac{3}{297}.\frac{1}{358}\)

\(=\frac{1}{358}.\left(7+\frac{1}{297}-7-\frac{3}{297}\right)-\left(4-\frac{1}{358}\right).\frac{2}{297}\)

\(=\frac{1}{358}.\left(-\frac{2}{297}\right)-\frac{2}{297}.\left(4-\frac{1}{358}\right)\)

\(=\left(-\frac{2}{297}\right)\left(\frac{1}{358}+4-\frac{1}{358}\right)\)

\(=\left(-\frac{2}{297}\right)\left(-4\right)\)

\(=\frac{8}{297}\)

Vậy giá trị biểu thức A là \(\frac{8}{297}\)

Hướng dẫn giải:

+ 1273 + 536 : 4 = 1273 + 134 = 1407

+ Với m = 2, giá trị biểu thức (12 694 + 9125) x m là: 

(12694 + 9125) x m = (12694 + 9125) x 2 = 21819 x 2 = 43638

\(A=\dfrac{1}{358}.\left(7+\dfrac{1}{297}\right)-\left(4-\dfrac{1}{358}\right).2.\dfrac{1}{297}-7.\dfrac{1}{358}-3.\dfrac{1}{297}.\dfrac{1}{359}\)

\(A=7.\dfrac{1}{358}+\dfrac{1}{297}.\dfrac{1}{358}-4.2.\dfrac{1}{297}+2.\dfrac{1}{297}.\dfrac{1}{358}-7.\dfrac{1}{358}-3.\dfrac{1}{297}.\dfrac{1}{359}\)

\(A=\left(7.\dfrac{1}{358}-7.\dfrac{1}{358}\right)+\left(\dfrac{1}{297}.\dfrac{1}{358}+2.\dfrac{1}{297}.\dfrac{1}{358}-3.\dfrac{1}{297}.\dfrac{1}{358}\right)-4.2.\dfrac{1}{297}\)

\(A=0+0+\dfrac{-8}{297}\)

\(A=\dfrac{-8}{297}\)

Chúc bạn học tốt!!!

A= \(\dfrac{1}{358}\left(7+\dfrac{1}{297}\right)-\left(4-\dfrac{1}{358}\right).2.\dfrac{1}{297}-7.\dfrac{1}{358}-3.\dfrac{1}{297}.\dfrac{1}{358}\)

A= \(\dfrac{7}{358}+\dfrac{1}{358.297}-\dfrac{8}{297}+\dfrac{2}{358.297}-\dfrac{7}{358}-\dfrac{3}{358.297}\)

A= \(-\dfrac{8}{297}\)

\(A=\dfrac{1}{358}.\left(7+\dfrac{1}{297}\right)-\left(4-\dfrac{1}{359}\right).2.\dfrac{1}{297}-7.\dfrac{1}{358}-3.\dfrac{1}{297}.\dfrac{1}{358}\)

\(A=7.\dfrac{1}{358}+\dfrac{1}{297}.\dfrac{1}{358}-2.4.\dfrac{1}{297}+2.\dfrac{1}{297}.\dfrac{1}{359}-7.\dfrac{1}{358}-3.\dfrac{1}{297}.\dfrac{1}{358}\)

\(A=\left(7.\dfrac{1}{358}-7.\dfrac{1}{358}\right)+\left(\dfrac{1}{297}.\dfrac{1}{358}-2.\dfrac{1}{297}.\dfrac{1}{359}-3.\dfrac{1}{297}.\dfrac{1}{358}\right)-8.\dfrac{1}{297}\)

\(A=-4.\dfrac{1}{297}.\dfrac{1}{359}-8.\dfrac{1}{297}\)

\(A=-4.\dfrac{1}{297}\left(\dfrac{1}{359}+2\right)\)

\(A=\dfrac{-4}{297}.\dfrac{719}{359}=\dfrac{-2876}{106623}\)

Chúc bạn học tốt!!!