(4/17+1/25)x17x25=4/17x17x25+1/25x25x17=100+17=117 (5/12+5/18)÷5/8+7/8=5/12÷5/8+5/18÷5/8+7/8=8/12+8/18+7/8=3/4+4/9+7/8=54/72+32/72+63/72=(54+32+63)/72=149/72