55 – y + 33 = 76  

55 -  y         =  76 – 33

55 -  y         =  43

y                  =  55 – 43

y                  =  12

55-y+33=76

55-y=76-33

55-y=43

y=55-43

y=12

55-y+33=76

55-y=76-33

55-y=43

y=56-43

y=13

55 - y + 33 = 76

(55 + 33) - y = 76

88 - y = 76

y = 88 - 76

y = 12

55 - y + 33 = 76

55 - y = 76 - 33

55 - y = 43

y         = 43 + 55

y           = 98

*Ryeo*

Bạn ๖²⁴ʱ๖ۣۜ๖ۣۜRүεσ༉~❄(тєαм❄ƒαιяу❄тαιℓ❄)❄~ làm sai rồi ạ!

\(55-y+33=76\)

\(55-y=76-33\)

\(55-y=43\)

\(y=55-43\)

\(y=12\)

52 \(\times\) ( y : 78) = 3380

          y : 78 =  3380: 52

          y : 78 = 65

         y          = 65 \(\times\) 78

       y = 5070

y: 55 - y + 33 = 76

\(y\) \(\times\) ( \(\dfrac{1}{55}\) - 1) = 76 - 33

y \(\times\) ( \(\dfrac{-54}{55}\) ) = 43

 y                = 43 : (- \(\dfrac{54}{55}\))

y = - \(\dfrac{2365}{54}\)

55-y+33=76

55-y     = 76-33

55  - y  = 43

y          = 55-43

y          = 12

55 - y + 33 = 76 

    55 - y     = 76 - 33 

    55 - y     = 43 

           y     = 55 - 43

           y     = 12 nha bạn

a. \(\frac{7}{3}\)+ \(\frac{2}{5}\): y = \(1\frac{1}{3}\)

\(\frac{2}{5}\): y = -1

y = \(-\frac{2}{5}\)

b. 52(y : 78) = 3380

y : 78 = 65

y = 5070

c. 55 - y + 33 = 76

55 - y = 76 - 33

y = 55 - 43

y = 12

quá dễ

1) 2-2+2-2=0;2/2*2/2=1;2/2+2/2=2;2-2/2+2=3;2+2-2+2=4;2+2+2/2=5;2*(2/2+2)=6;2+2+2+2=8;22/2-2=9;(22-2)/2=10

(còn số 7 không làm được)

2) a) \(52\cdot\frac{y}{78}=3380\)

\(52\cdot\frac{1}{78}\cdot y=3380\)

\(\frac{2}{3}\cdot y=3380\)

\(y=3380\div\frac{2}{3}=5070\)

b)\(55-y+33=76\)

\(88-y=76\)

\(y=88-76=12\)

3)\(3,54\cdot73+0,23\cdot25+3,54\cdot27+0,17\cdot25\)

\(=3,54\cdot\left(73+27\right)+25\cdot\left(0,27+0,13\right)\)

\(=3,54\cdot100+25\cdot0,4\)

\(=354+10=364\)

a) \(980+y:94=8245\)

\(y:94=7265\)

\(y=7265\times94\)

\(y=682910\)

b) \(45\times y\times36=3240\)

\(45\times y=3240:36\)

\(45\times y=90\)

\(y=90:45\)

\(y=2\)

c) \(3865-y+875=1000\)

\(3865-y=125\)

\(y=3865-125\)

\(y=3740\)

d) \(4788:126\times y=1596\)

\(126\times y=4788:1596\)

\(126\times y=3\)

\(y=\dfrac{3}{126}\)

\(y=\dfrac{1}{42}\)

e) \(24624:y:9=76\)

\(y:9=24624:76\)

\(y:9=324\)

\(y=324\times9\)

\(y=2916\)