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9.(5又13/15+5又8/17)x3/4+0.75x(4又2/15+4又9/17)
=3/4(5又13/15+5又8/17+4又2/15+4又9/17)
=3/4[9又(13+2)/15+9又(8+9)/17]
=3/4x(9+1+9+1)
=3x5=15
10.1993x19941994-1994x19931993
=1993(19940000+1994)-1994(19930000+1993)
=1993x19940000+1993x1994-1994x19930000-1993x1994
=1993x1994x10000-1994x1993x10000
=0
11.(10.25-8又9/14)x[(1/3+1/2)÷3又1/3+1.55]
=(2.25-9/14)x[(2+3)/6x3/10+1.55]
=(225/100-9/14)x(0.25+1.55)
=(9/4-9/14)x1.3
=(9x7-9x2)/28x1.3
=45/28x13/10
=9/28x13/2
=2又5/56
12.132又1/130÷131
=(132x130+1)/(130x131)
=[(131+1)130+1]/(130x131)
=(131x130+130+1)/(130x131)
=1+1/130
=1又1/130
=3/4(5又13/15+5又8/17+4又2/15+4又9/17)
=3/4[9又(13+2)/15+9又(8+9)/17]
=3/4x(9+1+9+1)
=3x5=15
10.1993x19941994-1994x19931993
=1993(19940000+1994)-1994(19930000+1993)
=1993x19940000+1993x1994-1994x19930000-1993x1994
=1993x1994x10000-1994x1993x10000
=0
11.(10.25-8又9/14)x[(1/3+1/2)÷3又1/3+1.55]
=(2.25-9/14)x[(2+3)/6x3/10+1.55]
=(225/100-9/14)x(0.25+1.55)
=(9/4-9/14)x1.3
=(9x7-9x2)/28x1.3
=45/28x13/10
=9/28x13/2
=2又5/56
12.132又1/130÷131
=(132x130+1)/(130x131)
=[(131+1)130+1]/(130x131)
=(131x130+130+1)/(130x131)
=1+1/130
=1又1/130
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