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a) (x + 73) - 26 = 76
x + 73 = 76 + 26
x + 73 = 102
x = 102-73
x = 29
b) 45-(c + 9) = 6
c + 9 = 6 + 45
c + 9 =51
c =51 - 9
c = 42
c) 89 - (73 - x)= 20
73 - x = 89 - 20
73 - x = 69
x = 73 - 69
x = 4
d) (x + 7) - 25 = 13
x + 7 = 13 + 25
x + 7 = 38
x = 38 - 7
x = 31
e) 198 - (x + 4) = 120
x + 4 = 198 - 120
x + 4 = 68
x = 68 - 4
x = 64
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400 - 861:[ 372:4 \(\times\) \(x\) - 1620:9] -199 = 198
400 - 861:[ 93 \(\times\) \(x\) - 180] - 199 = 198
400 - 861:[ 93 \(\times\) \(x\) - 180] = 198 + 199
400 - 861:[ 93 \(\times\) \(x\) - 180] = 397
861: [ 93 \(\times\) \(x\) - 180] = 400 - 397
861: [ 93 \(\times\) \(x\) - 180] = 3
[ 93 \(\times\) \(x\) - 180] = 861: 3
93\(\times\) \(x\) - 180 = 287
93 \(\times\) \(x\) = 287 + 180
93 \(\times\) \(x\) = 467
\(x\) = 467: 93
\(x\) = \(\dfrac{467}{93}\)
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198 x 78 + 198 x 21 + 198 = 198 + 78 + 198 x 21 + 198 x 1
= 198 x ( 78 + 21 + 1 )
= 198 x 100
= 19800
198 x 78 + 198 x 21 + 198 = 198 x 78 + 198 x 21 + 198 x 1= 198 x (78 + 21 + 1 ) = 198 x 100 = 19800
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x = 74 nhé
64 nhé bn