a , ( 314 - x ) - 42 = 0
( 314 - x ) = 42 + 0
314 - x = 42
x = 314 - 42
x = 272
b , 540 + ( 340 - x ) = 740
( 340 - x ) = 740 - 540
340 - x = 200
x = 340 -200
x = 140
c , ( x - 72 ) : 36 = 418
( x - 72 ) = 418 * 36
x - 72 = 15048
x = 15048 + 72
x = 15120
d , 2010 * ( x - 14 ) = 0
( x - 14 ) = 0 : 2010
x - 14 = 0
x = 0 + 14
x = 14
e , ( x - 2 ) * ( x - 4 ) = 0
⇒ x - 2 = 0 hoặc x - 4 = 0
⇒ x = 2 hoặc x = 4
f , 114 - ( x - 47 ) = 0
( x - 47 ) = 114 - 0
x - 47 = 114
x = 114 + 47
x = 161
g , sai đề rồi hay sao ấy pn ak