Toán Lớp 6: Chứng minh rằng (21 x a + 1; 30 x a + 2) với mọi a chẵn
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Toán Lớp 6: Chứng minh rằng (21 x a + 1; 30 x a + 2) với mọi a chẵn
Comments ( 1 )
->{(\text{21.a chẵn}),(\text{30.a chẵn}):}<=>{(\text{21.a+1 lẻ}),(\text{30.a+2 chẵn}):}
->(21*a+1; 30*a+2)=1