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數學不會算解出來給10點

Jul 9th 2013, 10:28

18
90*a=18*360
a=72

19
1，7，13，19，…
1，10，19，28，…
a1=1，a2=19
d=19－1=18
a15=a1+14d=1+14*18=253

(6+17/24)－2.875
=4+17/24－0.875
=4+17/24－7/8
=3+41/24－21/24
=3+20/24
=3+5/6

7
Sol
(4+2/8)－(3+2/3)=1+1/4－2/3=5/4－2/3=15/12－8/12=7/12
7/12=A/12=63/B
A=12
B=108
A+B=120

8
(2+1/4)－(1+2/15)+1/12+(4+4/5)
=9/4－17/15+1/12+24/5
=135/60－68/60+5/60+288/60
=(135－68+5+288)/60
=360/60
=6

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