求下列各式的值(a)4又2/3+2又1/2-1又5/6 (b)4-2又3/7 +1又1/8
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(a)4又2/3+2又1/2-1又5/6
=(4+2/3)+(2+1/2)-(1+5/6)
=4+2/3+2+1/2-1-5/6
=4+2-1+2/3+1/2-5/6
=6-1+2/3+1/2-5/6
=5+4/6+3/6-5/6
=5+7/6-5/6
=5+2/6
=5+1/3
=5又1/3
(b)4-2又3/7 +1又1/8
=4-(2+3/7)+(1+1/8)
=4-2-3/7+1+1/8
=4-2+1-3/7+1/8
=2+1-3/7+1/8
=3-24/56+7/56
=3-17/56
=2+56/56-17/56
=2+39/56
=2又39/56
=(4+2/3)+(2+1/2)-(1+5/6)
=4+2/3+2+1/2-1-5/6
=4+2-1+2/3+1/2-5/6
=6-1+2/3+1/2-5/6
=5+4/6+3/6-5/6
=5+7/6-5/6
=5+2/6
=5+1/3
=5又1/3
(b)4-2又3/7 +1又1/8
=4-(2+3/7)+(1+1/8)
=4-2-3/7+1+1/8
=4-2+1-3/7+1/8
=2+1-3/7+1/8
=3-24/56+7/56
=3-17/56
=2+56/56-17/56
=2+39/56
=2又39/56
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