e: =>-40+3+33+40-x=47

=>36-x=47

=>x=-11

f: =>x(x-3)(11-x)(11+x)=0

hay \(x\in\left\{0;3;11;-11\right\}\)

g: =>-62-38-x+2x=-100

=>x-100=-100

hay x=0

i: =>x-12-2x-31=6

=>-x-43=6

=>x+43=-6

hay x=-49

h: =>(x+1)=0

=>x=-1

f: =>x(x-3)(x+11)(x-11)=0

hay \(x\in\left\{0;3;-11;11\right\}\)

đáp án là 361 bạn nhé !!!

Xx62+Xx38=36100 đúng hông

42 nha

X x 62 + X x 38 = 4200

X x (62+38)=4200

X=4200:100=42

Đáp số : 42

X x 62 + X x 38 = 4200

X x ( 62 + 38 ) =   4200

X x    100        =   4200

X                    = 4200: 100

X                    =   42

Đưa về:

x^2+100=4200

=> x^2=4200:100=42

x^2=42=> x=\(\sqrt{42}\)

ko biết đúng hay sai đây

a/ 48 + 25 – 38 = 73 – 38 = 35

b/ 100 - 38 + 15 = 62 + 15 = 77

+) 187 x ( 38 + 62 ) - 87 x ( 62 + 38 )

= ( 62 + 38 ) x ( 187 - 87 )

= 100 x 100

= 10000

p/s : làm từng phần đợi mk chút ^^

25 x { 32 : [ 12 - 4 + 4 x ( 16 : 8 ) ] }

= 25 x { 32 : [ 8 + 4 x 2 ] }

= 25 x { 32 : 16 }

= 25 x 2

= 50

\(187\times\left(38+62\right)-87\times\left(62+28\right).\)

\(=187\times100+87\times100\)

\(=100\times\left(187-87\right)\)

\(=100\times100\)

\(=10000\)

\(25\times\left\{32:\left[12-4+4\times\left(16:8\right)\right]\right\}\)

\(=25\left\{32:\left[12-4+4\times2\right]\right\}\)

\(=25\times\left\{32:\left[12-4+8\right]\right\}\)

\(=25\times\left\{32:16\right\}\)

\(=25\times2=50\)

4900 100000%

49x38+49x62

=49x(38+62)

=49x100=4900

=49x(38+62)

=4900