先化简,再求值:当=1/2时,求15㎡-9-{-4m²+[5m-8m²-(2m²-m)]-
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先化简,再求值:当=1/2时,求15㎡-9-{-4m²+[5m-8m²-(2m²-m)]-3m}的值
![先化简,再求值:当=1/2时,求15㎡-9-{-4m²+[5m-8m²-(2m²-m)]-](/uploads/image/z/16513321-49-1.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%EF%BC%9A%E5%BD%93%3D1%2F2%E6%97%B6%2C%E6%B1%8215%E3%8E%A1-9-%EF%BD%9B-4m%26sup2%3B%2B%5B5m-8m%26sup2%3B-%282m%26sup2%3B-m%29%5D-)
原式=15m²-9+4m²-5m+8m²+2m²-m+3m
=15m²+4m²+8m²+2m²-5m-m+3m-9
=29m²-3m-9
=29/4-3/2-9
=29/4-21/2
=-13/4
=15m²+4m²+8m²+2m²-5m-m+3m-9
=29m²-3m-9
=29/4-3/2-9
=29/4-21/2
=-13/4
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