若a=2,b=1/20 ,求ba²-5a(-a+b+1)+4a(3a+2),先化简,再求值.
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![若a=2,b=1/20 ,求ba²-5a(-a+b+1)+4a(3a+2),先化简,再求值.](/uploads/image/z/379716-60-6.jpg?t=%E8%8B%A5a%3D2%2Cb%3D1%2F20+%2C%E6%B1%82ba%26%23178%3B-5a%28%EF%BC%8Da%2Bb%2B1%29%2B4a%283a%2B2%29%2C%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC.)
若a=2,b=1/20 ,求ba²-5a(-a+b+1)+4a(3a+2),先化简,再求值.
若a=2,b=1/20 ,求ba²-5a(-a+b+1)+4a(3a+2),先化简,再求值.
若a=2,b=1/20 ,求ba²-5a(-a+b+1)+4a(3a+2),先化简,再求值.
ba²-5a(-a+b+1)+4a(3a+2)
=ba²+5a²-5ab-5a+12a²+8a
=ba²+17a²-5ab+3a
代入a=2,b=1/20
=4/20+20-1/2+6
=25.7