gọi số bé là x số lớn là y ta có:
x+y=102
10x+y=417
9x+x+y=417
9x+102=417
9x=417-102=315
x=315:9=35
y=67
gọi số bé là x số lớn là y ta có:
x+y=102
10x+y=417
9x+x+y=417
9x+102=417
9x=417-102=315
x=315:9=35
y=67
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