s + k 5 = w 5 × 2 5 = k w + w kk + s w = 2- k s = w 7 ÷ 6 7 =0.s2=7.2×0.25×w= ks 7 - w 5 - k 5 = 试题答案 4 5 + 2 5 = 你 5 , 24 35 ÷32= 2 35 , 3 3 + 3 5 = b 35 , 4 5