(1)3 xy (4 x 2- y )
(2) x (1+3 x )(1-3 x )
(3)3( a -2 b ) 2
(1)原式=3 xy (4 x 2- y )
(2)原式= x (1-9 x 2)= x (1+3 x )(1-3 x )
(3)原式=3 a 2-12 ab+ 12 b 2=3( a 2-4 ab+ 4 b 2)=3( a -2 b ) 2
1年前
2
(1)3 xy (4 x 2- y )
(2) x (1+3 x )(1-3 x )
(3)3( a -2 b ) 2
(1)原式=3 xy (4 x 2- y )
(2)原式= x (1-9 x 2)= x (1+3 x )(1-3 x )
(3)原式=3 a 2-12 ab+ 12 b 2=3( a 2-4 ab+ 4 b 2)=3( a -2 b ) 2
1年前
2