(-3/4)*(8-1又1/3-0.04+3又1/5)
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![(-3/4)*(8-1又1/3-0.04+3又1/5)](/uploads/image/z/5228352-0-2.jpg?t=%28-3%2F4%29%2A%288-1%E5%8F%881%2F3-0.04%2B3%E5%8F%881%2F5%EF%BC%89)
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(-3/4)*(8-1又1/3-0.04+3又1/5)
(-3/4)*(8-1又1/3-0.04+3又1/5)
(-3/4)*(8-1又1/3-0.04+3又1/5)
=(-3/4)(8-4/3-1/25+16/5)=-6+1+(-3/4)(-1/25+16/5)=-5-(3/4)×(79/25)=-5-237/100=-5.237