用合适的词填空。 |
1 ________ + three = nine 2 four - ________ = two 3 eight + one = _________ 4 six - ______ = seven 5 six + _______= seven 6 four + four = _______ 7 one + ______ = one 8 five + one = ________ 9 _______ - three = four 10 two + _______ = six |