[[乗法公式]] にもどる 【問題I-1-2-2】次の式を展開せよ. (1)<img src="http://cosmath.com/cgi/mime/mimetex.cgi?3x(2x^2-x)" border="0" align="absmiddle"> (1) &ref(exI01020201.gif); (2) &ref(exI01020202.gif); (3) &ref(exI01020203.gif); (4) &ref(exI01020204.gif); (5) &ref(exI01020205.gif); (6) &ref(exI01020206.gif); (7) &ref(exI01020207.gif); (8) &ref(exI01020208.gif); (9) &ref(exI01020209.gif); (10) &ref(exI01020210.gif); ([[解答I-1-2-2]])