(+3 3/4)-(-1 1/2)+(-1/6)-(-5/8)+(+4 2/3)=? 2-(5 5/6)-(4 3/7)+(-2 1/6)-(6 11/21)=?((过程)
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(+3又 3/4)-(-1又 1/2)+(-1/6)-(-5/8)+(+4又 2/3)
=3 又3/4+1 又1/2+5/8+(4又 2/3-1/6)
= 3又 3/4+5/8+(4又1/2+1又 1/2)
=4又3/8+6
=10又3/8
2-(5又 5/6)-(4 又3/7)+(-2 又1/6)-(6又 11/21)
=2-(5又5/6+2又1/6)-(4又3/7+6又11/21)
=2-8-10又20/21
=-16又20/21
=3 又3/4+1 又1/2+5/8+(4又 2/3-1/6)
= 3又 3/4+5/8+(4又1/2+1又 1/2)
=4又3/8+6
=10又3/8
2-(5又 5/6)-(4 又3/7)+(-2 又1/6)-(6又 11/21)
=2-(5又5/6+2又1/6)-(4又3/7+6又11/21)
=2-8-10又20/21
=-16又20/21
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