Respuesta:
1.- a) 67 + x = 90
x = 90 - 67
x = 23
b) x + 53 = 60
x = 60 - 53
x = 7
c) 33 + x = 66
x = 66 - 33
x = 33
d) 84 + x = 93
x = 93 - 84
x = 9
e) 17 + x = 30
x = 30 - 17
x = 13
f) x + 75 = 85
x = 85 - 75
x = 10
g) x - 12 = 6
x = 6 + 12
x = 18
h) x - 24 = 6
x = 6 + 24
x = 30
i) x - 30 = 9
x = 9 + 30
x = 39
2) a) 380 - 230 = 150
b) 500 - 260 = 240
c) 600 - 190 = 410
d) 430 - 215 = 215
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Verified answer
Respuesta:
1.- a) 67 + x = 90
x = 90 - 67
x = 23
b) x + 53 = 60
x = 60 - 53
x = 7
c) 33 + x = 66
x = 66 - 33
x = 33
d) 84 + x = 93
x = 93 - 84
x = 9
e) 17 + x = 30
x = 30 - 17
x = 13
f) x + 75 = 85
x = 85 - 75
x = 10
g) x - 12 = 6
x = 6 + 12
x = 18
h) x - 24 = 6
x = 6 + 24
x = 30
i) x - 30 = 9
x = 9 + 30
x = 39
2) a) 380 - 230 = 150
b) 500 - 260 = 240
c) 600 - 190 = 410
d) 430 - 215 = 215