LOP 6

cap truong :1020

cap huyen:1180

my name is TRAM ANH\

my favourite subject is MATH,ART

my father name is Tuan

In my house

mình cũng là fan conan nè

A.goi a=12k,b=12h (k,h thuoc N*,k<h)

a+b=12k+12h=12(k+h)

=> k+h=96:12=8

co 8=1+7=2+6=3+5=4+4

vi k<h nen (k,h) thuoc {1,7},{2,6},{3,5}

=>(a,b)thuoc {(12,84),(24,72),(36,60)}

cau b,c ban tu lam nhe

a) (-57).11=(-57).(10+1)=(-57).10+(-57).1=(-570)+(-57)=-627

b)75.(-21)=75.(-20)+(-1)=75.(-20)+75.(-1)=(-1500)+(-75)=-1575

c)(-98.(1-246)-246.98=-(98-98).(-245)-246=0.-245-246=0

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