1、∵A=45° B=30°∴C=105°∵a/sinA=b/sinB=c/sinC=10/sin105°=10(√6-√2)∴a=10(√6-√2)sin45°=10(√3-1)b=10(√6-√2)sin30°=5(√6-√2)2、a/sinA=b/sinB=c/sinC=4/sin45°=4√2sinC=2√6 /4√2=√3/2∴C=60°或C=120°∴B=75°或B=15°b=4√2sinB=2√3+2或b=2√3-2①C=60°,B=75°,b=2√3+2②C=120°,B=15°,b=2√3-2