用简便的方法计算,~(\3{)G'k0~:X9a-S
9÷ [0.3×（9-7.5）],~(\3{)G'k0~:X9a-S
算式：提示;n:j*B/f,~(\3{)G'k0~:X9a-S
=(N-S*y8N5c5@3w(g,~(\3{)G'k0~:X9a-S