98.5-21.2*0.5+1.2 怎么先减后加最后乘
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98.5-21.2*0.5+1.2 怎么先减后加最后乘
98.5-21.2*0.5+1.2 怎么先减后加最后乘
98.5-21.2*0.5+1.2 怎么先减后加最后乘
(98.5-21.2+1.2)*0.5
98.5-21.2*0.5+1.2 怎么先减后加最后乘
98.5-21.2*0.5+1.2 怎么先减后加最后乘
98.5-21.2*0.5+1.2 怎么先减后加最后乘
(98.5-21.2+1.2)*0.5