so be la
120:2x1/2=30
so lon la
120-30=90
gọi a và b là hai số
ta co : a=1/2b
=>2a=b
ma a+b= 120
thay
a+2a=120
3a=120
a=40
=>b=80
so be la
120:2x1/2=30
so lon la
120-30=90
gọi a và b là hai số
ta co : a=1/2b
=>2a=b
ma a+b= 120
thay
a+2a=120
3a=120
a=40
=>b=80
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