解答问题!急!!!算式!!!!
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(7)原式=(13又8/13-7又2/13+36又6/13)×1/6
=42又12/13×1/6
=42×1/6+12/13×1/6
=7+2/23
=7又2/13
(8)-4又1/8÷1又1/32-(-1又1/2)÷(2又2/9)×(-2又2/3)-0.25÷1/68×(-15/17)
=-42+27/40×(-2又2/3)-17×(-15/17)
=-42-1.8+15
=-28.8
(9)[47-(18.75-1÷8/15)×2又6/25]÷0.46+(-3又1/3)÷(-10)×(-2又1/2)
=[47-(18.75-1又7/8)×2又6/25]÷0.46+1/3×(-2又1/2)
=[47-16又7/8×2又6/25]÷0.46-2/15
=[47-189/5]÷0.46-2/15
=9.2÷0.46-2/15
=20-2/15
=19又13/15
=42又12/13×1/6
=42×1/6+12/13×1/6
=7+2/23
=7又2/13
(8)-4又1/8÷1又1/32-(-1又1/2)÷(2又2/9)×(-2又2/3)-0.25÷1/68×(-15/17)
=-42+27/40×(-2又2/3)-17×(-15/17)
=-42-1.8+15
=-28.8
(9)[47-(18.75-1÷8/15)×2又6/25]÷0.46+(-3又1/3)÷(-10)×(-2又1/2)
=[47-(18.75-1又7/8)×2又6/25]÷0.46+1/3×(-2又1/2)
=[47-16又7/8×2又6/25]÷0.46-2/15
=[47-189/5]÷0.46-2/15
=9.2÷0.46-2/15
=20-2/15
=19又13/15
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