\(\dfrac{7,5+1,5+\dfrac{5}{4}+\dfrac{5}{11}}{10,5+2,1+\dfrac{7}{4}+\dfrac{7}{11}}+x=\dfrac{6}{7}\)

\(\dfrac{9+\dfrac{5}{4}+\dfrac{5}{11}}{\dfrac{63}{5}+\dfrac{7}{4}+\dfrac{7}{11}}+x=\dfrac{6}{7}\)

\(\dfrac{\dfrac{36}{4}+\dfrac{5}{4}+\dfrac{5}{11}}{\dfrac{252}{20}+\dfrac{35}{20}+\dfrac{7}{11}}+x=\dfrac{6}{7}\)

\(\dfrac{\dfrac{41}{4}+\dfrac{5}{11}}{\dfrac{287}{20}+\dfrac{7}{11}}+x=\dfrac{6}{7}\)

\(\dfrac{\dfrac{451}{44}+\dfrac{20}{44}}{\dfrac{3157}{220}+\dfrac{140}{220}}+x=\dfrac{6}{7}\)

\(\dfrac{\dfrac{471}{44}}{\dfrac{3297}{220}}+x=\dfrac{6}{7}\)

\(\dfrac{5}{7}+x=\dfrac{6}{7}\)

\(x=\dfrac{6}{7}-\dfrac{5}{7}\)

\(x=\dfrac{1}{7}\)

X x (1,5 + 7,5) = 11,6 

X x 9 = 11,6 

X = 1,28

X x(1,5+7,5+1)=11,6

Xx10=11,6

X=11,6:10

X=1,16

X x (1,5 + 7,5) = 11,6 

X x 9 = 11,6 

X = 1,28

\(37,5.8,5-7,5.3,4-6,6.7,5+1,5.37,5\)

\(=(37,5.8,5+1,5.37,5)-(7,5.3,4+6,6.7,5)\)

\(=37,5.\left(8,5+1,5\right)-7,5\left(3,4+6,6\right)\)

\(=37,5.10-7,5.10=10.\left(37,5-7,5\right)=10.30=300\)

= (37,5.8,5 + 15 . 37,5 )-(7,5 . 3.4 + 6,6 .7,5)

= 37,5(8,5 + 15) - 7,5 (3,4 +6,6 )

=881,25 - 75 = 806,25

xin lỗi bạn mình làm sai rồi

X x 1,5 +X +X x7,5=59,8

X x (1,5+1+7,5)=59,5

X x 10=59,5

X=59,5 : 10 =5,95

\(x\cdot1,5-5,61=6,45\)

\(x\cdot1,5=12,06\)

\(x=8,04\)

\(89:x+51,5:x=62,5\)

\(\left(89+51,5\right):x=62,5\)

\(140,5:x=62,5\)

\(x=2,248\)

\(748:\left(x-31,72\right)=13,6\)

\(x-31,72=55\)

\(x=86,72\)

a,2,5-x=1,3

x=2,5-1,3

x=1,2

b,x-3,5=7,5

x=7.5+3,5

x=11

c,(x-1,5)-2,5=0

x-1,5=2,5

x=2,5+1,5

x=4

d,1,6-(x-0,2)=0

x-0,2=1,6

x=1,6+0,2

x=1,8

A=(3,7- -x)+2,5

vì 2,5>=0 với mọi x

=> x=-1,2

B= (x+1,5)-4,5

Vì -4,5<=0 với mọi x

=> x=-6

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