18.8—(4/23—5/7)—4/17等于多少?
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先算分数,把分数的分母统一:
18.8-(4/23-5/7)-4/17
=18.8-(4/23-5/7+4/17)
=18.8-(4×7×17/23×7×17-5×23×17/7×23×17+4×23×7/17×23×7)
=18.8-(476/2737-1955/2737+644/2737)
=18.8-(-835/2737)
=18.8+835/2737
=94/5+835/2737
=94×2737/2737×5+835×5/2737X5
=257278/13685+4175/13685
=261453/23685
=87151/7895
11又7895分之306
18.8-(4/23-5/7)-4/17
=18.8-(4/23-5/7+4/17)
=18.8-(4×7×17/23×7×17-5×23×17/7×23×17+4×23×7/17×23×7)
=18.8-(476/2737-1955/2737+644/2737)
=18.8-(-835/2737)
=18.8+835/2737
=94/5+835/2737
=94×2737/2737×5+835×5/2737X5
=257278/13685+4175/13685
=261453/23685
=87151/7895
11又7895分之306
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