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x÷1/4=5/12÷3/4

x÷1/4=5/12÷3/4 4x=5/9 x=5/9÷4 x=5/36

①x=15/28*4/5=3/7 ②x=12*1/4÷2/3=9/2

1/3╳3/4÷(3/4-5/12)能简要简 =1/4÷(9/12-5/12) =1/4÷1/3 =3/4

g

谢谢希望能帮到你 5/12÷[(1/4-1/7×3/6)] =5/12÷(1/4-/14) =5/12÷5/28 =7/3

解: 把分数写规范 (-3)÷(-2/5)÷(-1/4)-12x(5/6-1/3-1/4) =(-3)*(-5/2)*(-4)-12*5/6+12*1/3+12*1/4 =-30-10+4+3 =-40+7 =-33

1/3×3/4÷(3/4-5/12)=1/3÷(3/4-5/12)×3/4=1×3/4=3/4 乘法交换律

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