a) 142+(118-x)=217
118-x =217-142
118-x =75
x =43
b) 818-(x-305)=712
x-305 =818-712
x-305 = 106
x = 411
c)x-32:16=48
x-2 =48
x =50
d)(x-32):16=48
x-32 =48.16
x-32 =768
x = 800
a ) x = 43
b ) x = 411
c ) x = 50
d ) x = 800
a)142+(118-x)=217
118-x =217-142
118-x =75
x=118-75
x=43
b)818-(x-305)=712
x-305 =818-712
x-305 =106
x=106+305
x=411
c)x-32:16=48
x-2 =48
x=48+2
x=50
d)(x-32):16=48
x-32 =48:16
x-32 =3
x=3+32
x=35
a,142+(118-x)=217
118-x=217-142
118-x=75
x=118-75
x=43
b,818-(x-305)=712
x-305=818-712
x-305=106
x=106+305
x=411
c,x-32:16=48
x-2=48
x=48+2
x=50
d,(x-32):16=48
x-32=48x16
x-32=768
x=768+32
x=800
**** bn nhes
a) 142 + (118 - x) = 217
118 - x = 217 - 142
118 - x = 75
x = 118 - 75
x = 43
b) 818 - (x - 305) = 712
x - 305 = 818 - 712
x - 305 = 106
x = 106 + 305
x = 411
c) x - 32 : 16 = 48
x - 2 = 48
x = 48 + 2
x = 50
d) (x - 32) : 16 = 48
x - 32 = 48 x 16
x - 32 = 768
x = 768 + 32
x = 800
k mk nha !