a) x-2/9=48/27 b) x+2/3=4/5 c) 7/9-x=1/3 d) x:2/3=9/8
2 câu trả lời
a,x-29-4827
⇔x-29=169
⇔x=169+29
⇔x=189
⇔x=2
b,x+23=45
⇔x=45-23
⇔x=1215-1015
⇔x=215
c,79-x=13
⇔x=79-13
⇔x=79-29
⇔x=59
d,x:23=98
⇔x=98×23
⇔x=34
a)x-29 =4827
x=4827 +29
x=2
b)x+23 =45
x=45 -23
x=215
c)79 -x=13
x=79 -13
x=49
d)x:23 =98
x=98 .23
x=34