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x=4,0(12)= 4,012121212...
100x=401,21212121...
99x= 397,2
x=3972/990
b) -3,2(7)
x= -3,277777...
100x= -327,7777...
99x= -330,5
x= -3305/990
b)-3,2(7)=-3,2+0,(7)=-32/10+7/9=-288/90+70/90=-218/90