0.38×5先把4[2l6K*y6t0N(a)F,s'R8O扩大([)^.{+A;M,y.N-E7S+E倍后再与6i4q(g+]:V+}相乘，再把所得的积1^5E8e;F.F/I't9x*[6Y9{。+n,}1I