(2÷3÷7+4÷6÷14+14÷21÷49)÷(4÷7÷9+8÷14÷18+28÷49÷63)=?为什么有的等于1.5,有的等于3分之2,到底哪个答案是对的啊?
(2÷3÷7+4÷6÷14+14÷21÷49)÷(4÷7÷9+8÷14÷18+28÷49÷63)=?为什么有的等于1.5,有的等于3分之2,到底哪个答案是对的啊?
(2÷3÷7+4÷6÷14+14÷21÷49)÷(4÷7÷9+8÷14÷18+28÷49÷63)=?
为什么有的等于1.5,有的等于3分之2,到底哪个答案是对的啊?
(2÷3÷7+4÷6÷14+14÷21÷49)÷(4÷7÷9+8÷14÷18+28÷49÷63)=?为什么有的等于1.5,有的等于3分之2,到底哪个答案是对的啊?
等于1.5是对的
(2÷3÷7+4÷6÷14+14÷21÷49)÷(4÷7÷9+8÷14÷18+28÷49÷63)
=(2/3÷7+2/3÷14+2/3÷49)÷(4/7÷9+4/7÷18+4/7÷63)
=(2/3÷7+2/3÷7÷2+2/3÷7÷7)÷(4/7÷9+4/7÷9÷2+4/7÷9÷7)
=2/3÷7x(1+1/2+1/7)÷[(4/7÷9)(1+1/2+1/7)]
=2/21 ÷ 4/63
=3/2(也就是1.5)
以上计算保证正确,不明白欢迎追问!
原式=[2/21*(1+1/2+1/7)]/[4/63*(1+1/2+1/7)]
=(2/21)/(4/63)
=3/2 即1.5
注意:A÷B÷C=A/(BC)
(2÷3÷7+4÷6÷14+14÷21÷49)÷(4÷7÷9+8÷14÷18+28÷49÷63)=?
=[2/(3×7)+4/(6×14)+14/(21×49)] ÷ [4/(7×9)+8/(14×18)+28/(49×63)]
=[2/21+1/21+2/(3×49)] ÷[4/63+2/63+4/(7×63)]
=(1...
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注意:A÷B÷C=A/(BC)
(2÷3÷7+4÷6÷14+14÷21÷49)÷(4÷7÷9+8÷14÷18+28÷49÷63)=?
=[2/(3×7)+4/(6×14)+14/(21×49)] ÷ [4/(7×9)+8/(14×18)+28/(49×63)]
=[2/21+1/21+2/(3×49)] ÷[4/63+2/63+4/(7×63)]
=(1/7)(1+2/21)÷[6/(7×9)+4/(7×63)]
=(23/21)÷(2/3+4/63)
=(23/21)÷(46/63)
=23×63/(21×46)
=3/2
=1.5
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