口算。3x;h(v5T9@/G2`4e:K*};b;a2['O,q*z
3×5+4=4Z+a0K;D8m/Z 2×5=)B;?+i7G+e3s6m-V(L*P;g3x;h(v5T9@/G2`4e:K*};b;a2['O,q*z
4×6-7=)k8a3c7_9a6×6+10=7K(N/p:\7P3x;h(v5T9@/G2`4e:K*};b;a2['O,q*z
4×4=)l(`5@)m/O6A,H3×4=8N.P,{6M6A5~,w(N7x*^5f9_3x;h(v5T9@/G2`4e:K*};b;a2['O,q*z
5×6-18=']8D-@5f3l8l2F*[ 2×4=4X'A1N4[1M7S9@2_,f,Z1l7D'K3x;h(v5T9@/G2`4e:K*};b;a2['O,q*z