24 : 4 = 132 - x .7

6 = 132 - x .7

132 - x .7 = 6

x . 7 = 132 - 6

x . 7 = 126

x = 126 : 7

x = 18

vậy x = 18

235 - x . 370 = x . 35

235 = x . 35 + x . 370

235 = x . ( 35 + 370 )

235 = x. 405

x . 405 = 235

x = 235 : 405

x = \(\frac{235}{405}\)

x = \(\frac{47}{81}\)

vậy x= \(\frac{47}{81}\)

( 674 - 529 ) : x . 2 = 58

145 : x .2 = 58

x . 2 = 145 : 58

x . 2 = 2,5

x = 2,5 : 2

x = 1,25

vậy x=1,25

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\(S=\frac{n\left(n+1\right)\left(2n+1\right)}{6}\)

\(S=\frac{100\left(100+1\right)\left(2.100+1\right)}{6}\)

\(S=\frac{100\left(101\right)\left(200+1\right)}{6}\)

\(S=\frac{100.101.201}{6}\)

\(S=\frac{10100.201}{6}\)

\(S=\frac{2030100}{6}\)

\(S=338350\)

455 - x : 2 . 6 = 31 . 5

455 - x : 2 . 6 = 155

x : 2 . 6 = 455 - 155

x : 2 . 6 = 300

x : 2 = 300 : 6

x : 2 = 50

x = 50 . 2

x = 100

vậy x=100

53,2 : ( x - 35 ) = 99 - 45,8

53,2 : ( x - 35 ) = 53,2

x - 35 = 53,2 : 53,2

x - 35 = 1

x = 1 + 35

x = 36

vậy x=36

x . ( 19,5 - 9,5 ) = 34,87

x . 10 = 34,87

x = 34,87 : 10

x = 348,7

Vậy x=348,7

x . 15 = 129 + 4,5

x . 15 = 133,5

x = 133,5 : 15

x = 8,9

vậy x=8,9

3,24 . x - 0,912 = 21,12

3,24 . x = 21,12 + 0,912

3,24 . x = 22,032

x = 22, 032 : 3,24

x = 6.8

Vậy x = 6.8