(1)2/3-1/2 =9z-i4N7F0T9D(k5D2d*d.r1S+K)g5h.B
(2)4.5×100= 3_*d-D;I1[*d.r1S+K)g5h.B
(3)5/9×6= 0F'B5S-[*F0R/o*d.r1S+K)g5h.B
(4)270÷18= 0m+N3i9E-c;U0|'S,i6z*X*d.r1S+K)g5h.B
(5)5 - 0.25+0.75=3g8B,b3H4T/Q,s4`:N*F.t3~*d.r1S+K)g5h.B
(6)0.42-0.32= 5M3O)`9Z(}.z4~*d.r1S+K)g5h.B
(7)2÷1/5=1M0s8f6n*d.r1S+K)g5h.B
(8)341-103=9n,T-w2d9j.H3I.}0E:e-J(V*d.r1S+K)g5h.B
(9)13×(2+7/13)= ;e1C5f'D4S*m0f;X6Y(j6L7X(Y)F1j*d.r1S+K)g5h.B
(10)():1/7=1/7 =7i6}(a-y4U5J:E:L9S*d.r1S+K)g5h.B