a)456+[1263-x]=1362
1263-x=1362-456
1263-x=906
x=1263-906
x=357
b)22.x+4=20
22.x =20-4
22.x =16
x =16:20
x =0.8
c)34.x+1=41
34.x =41-1
34.x =40
x =40:34
x =20/17
chắc chắn 100% k cho mình nha nguyenthuyngan
456 + [ 1263 - x] = 1326
1263 - x = 1326 - 456
1263 - x = 870
x = 1326 - 870
x= 456
22x + 4 = 20
22x = 24
x = 24/22
34x + 1 = 41
=> 34x = 40
=> x = 40/34
456+(1263-x)=1362
1263+x=1362-456
1263+x=906
x=906-1263
x=-357
456 + ( 1263 -x ) = 1362
456 + 1263 - 1362 = x
x = 456 + 1263 -1362
x = 357
b, 22x + 4 = 20
22x = 20 -4
22x = 16
x = 16/22
x = 8/11
c, 34x + 1 = 41
34x = 41 -1
34x = 40
x = 40/34
x = 20/17