口算。:O.P'u2z0]6U1`
72÷6=3r,M-T+A;r7V3r(k7j 150×4=5\,i+y.?)K'H3e8}8O6W+Y6w6`:N9A:O.P'u2z0]6U1`
0÷90=/^5\0@3?(H'{(o:d16×6=;P4r3_0o'r;|6n.l/P:^9G*V5Y:O.P'u2z0]6U1`
5×7+6=/q(L)G7a.j/o2|6B1V3g;B 8×60+3=2F'z1j)Z'|,f7G,{3i8O)i:O.P'u2z0]6U1`
90×60=*W8s*p9}1t/g,o't/_(M:O.P'u2z0]6U1`