15道分数简算
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被除数乘以除数的倒数,例如1/2除以3/2等于1/2*2/3
4/9÷6+5/9×1/612×(1-2/3÷3/4)(21/26×13/7+1/2)÷40%1/5÷(1-1/3×1/2)9/10×[7/8÷(4/5+1/4)]9×5/6+5/6÷1/95/6÷5
1.3/4*1/9+1/4*1/92.5/8*2/7+5/8*5/73.101*1/5-1/5*214.31*5*6-5/65.8*4/5+8*11/56.6*(1/2+2/3)7.(3/5-1*2)
解题思路:此题不易简算解题过程:答案见截图。最终答案:略
6÷3/8–3/8÷64/7×5/9+3/7×5/95/2-(3/2+4/5)6×(1/2+2/3)8×4/5+8×11/531×5/6–5/64/5×25/16+2/3×3/42+1/3-1/4+1
7511651-------------+-------------+-------------8612714217255258---------------1-------〔----+----〕42
1.3/7×49/92.8/9×15/363.12×5/64.8×5/45.6×3/86.4/7×5/97.3/2×4/58.7/8×1/89.9×5/6+5/610.3/4×8/9-1/311.7×
175-75÷2568+35×13725-(125+237)(114+166)÷35432÷(9×8)189-60+40三、简便计算.216+315÷1525×32÷447+236÷3+646×(15
这个分数乘另一个分数的倒数.例如.二分之一除二分之一.就是二分之一乘二.
分数a分之b除以分数c分之d等价于被除数乘以(除数的倒数)即:a分之b除以c分之d=a分之b乘以分数d分之c例如:(5分之2)除以(3分之2)=(5分之2)乘以(2分之3)=5分之3(分子分母约掉2)
2+1/[1-(3/4)](3/4)*(2/5)/(3/4)*(2/5)4/(1/5)-(1/5)/4(16/5)/(5/9)*(5/16)[(3/4)-(1/2)-(1/6)]*123/(3/4)-
①1/1×2+1/2×3+1/3×4.1/99×100=1-1/2+1/2-1/3+1/3-1/4+.+1/99-1/100=1-1/100=99/100②(4/9+6/7+5/21)÷(2/9+3/
(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6),经过正负抵销后的计算,最后答案简化成(1-1/6)=5/6再问:再问:这道题呢
解题思路:运算解题过程:varSWOC={};SWOC.tip=false;try{SWOCX2.OpenFile("http://dayi.prcedu.com/include/readq.php?
原式=(1+1/2)(1-1/2)(1+1/3)(1-1/3)················(1+1/2001)(1-1/2001)=3/2*1/2*4/3*2/3··············200
1.125*3+125*5+25*3+252.9999*3+101*11*(101-92)3.(23/4-3/4)*(3*6+2)4.3/7×49/9-4/35.8/9×15/36+1/276.12×
7/10x48+48x3/10=(7x48)/10+(48x3)/10=48x(7+3)/10=48;24x(5/12-1/24)=24x(10/24-1/24)=24x9/24=9;(20+4/5)
13/7×11/8-3/7×13/8=11/7×13/8-3/7×13/8=(11/7-3/7)×13/8=8/7×13/8=13/7
和整数简算道理一样,应用运算定律把可以得整数的先算出来.
1/3乘以7除以1/3=1/3除以1/3乘以7=1乘以7=7(7/9+7/6)乘以4/21=7/9乘以4/21+7/6乘以4/21=4/27+2/9=4/27+6/27=10/271/4除以5/8+3