口算。:](w'w4D9P:`)h3\
2×4=9M0e,h(_.]'X0~-b 5×5=8C(U.U+F,m6Q:](w'w4D9P:`)h3\
9×5=*c*_(g 30÷5=:B7c3G+[*p4[:a(k5C*m6@:](w'w4D9P:`)h3\
12÷2='_/?,S3Q5b 21÷3=0h3U6y.Y0Y:](w'w4D9P:`)h3\