分数乘法简算
\u6025\u3002\u3002\u3002\u8c01\u80fd\u7ed9\u6211\u51fa20\u9053\u5206\u6570\u4e58\u6cd5\u7b80\u7b97\uff01\uff01\uff01(1/2+2/3)*6=1/2*6+2/3*6=3+4=7
(2/3+3/4)*12=2/3*12+3/4*12=8+9=17
(1/3+1/4)*12=1/3*12+1/4*12=4+3=7
(1/4+1/5)*20=1/4*20+1/5*20=5+4=9
(2/3+2/5)*15=2/3*15+2/5*15=10+6=16
(3/4+1/2)*4=3/4*4+1/2*4=3+2=5
(10/11+12/10)*110=10/11*110+12/10*110=100+132=232
(2/5+2/7)*35=2/5*35+2/7*35=14+10=24
(3/5+3/7)*35=3/5*35+3/7*35=21+15=36
(4/5+5/6)*30=4/5*30+5/6*30=24+25=49
(5/7+5/8)*56=5/7*56*5/8*56=40+35=75
(8/9+9/10)*90=8/9+90*9/10*90=80+81=161
(11/12+6/5)*60=11/12*60+6/5*60=55+72=127
(9/5+9/4)*20=9/5*20+9/4*20=36+45=81
(4/7+5/6)*42=4/7*42+5/6*42=24+35=59
(3/8+2/9)*72=3/8*72+2/9*72=24+16=40
(1/11+1/15)*165=1/11*165+1/15*165=15+11=26
(1/20+1/30)*60=1/20*60+1/30*60=3+2=5
(2/31+3/62)*62=2/31*62+3/62*62=4+3=7
(11/16+13/32)*32=11/16*32+13/32*32=22+13=35
3.2*5/9+6\u53c84/5*5/9-5/9
=5/9\uff083.2 +6.8-1\uff09
=5/9*9
=5
2\u53c81/3*3/5+4*2/5+1\u53c82/3*3/5
=3/5\uff082\u53c81/3+1\u53c82/3\uff09+ 4*2/5
=3/5*4 +4*2/5
=4\uff083/5 +2/5\uff09
=4*1
=4
16*\uff083/4+5/9\uff09*275/18*6/7+2\u53c81/6*2/72\u53c81/3*3/5+4*2/5+1\u53c82/3*3/5
=\u672c\u9898\u786e\u5b9a\u6ca1\u9519\uff0c\u4e2d\u95f4\u90e8\u5206\uff0c2\u53c81/6*2/72\u53c81/3*3/5\uff0c\u4e0d\u6e05\u695a
5/18*6/7+2\u53c81/6*2/7
=5/18 * 6/7 + 13/6 * 2/7
=5/21 + 13/21
=18/21
=6/7
2/27*（15*27/28）*2/15
=(2/27x27/28)x(15x2/15)
=1/14x2
=1/7
15/21*3/4+10/21*3/4-3/4
=3/4x(15/21+10/21-1)
=3/4x4/21
=1/7
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2/27*（15*27/28）*2/15=2*15*27*2/(27*28*15)=1/7
15/21*3/4+10/21*3/4-3/4=3/4(15/21+10/21-1)=3/4 (4/21)=1/7
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