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25x24%2.8x5/7筒算快快快

7分之12—(7分之5+2分之1) =12/7-5/7-1/2 =7/7-1/2 =1-1/2 =1/2 [1—(4分之1+8分之3)]除以4分之1 =(1-1/4-3/8)x4 =1x4-1/4x4-3/8x4 =4-1-3/2 =3-3/2 =3/2 =1又1/2 8分之1 x 58+8分之1 x 42 =1/8x(58+42) =1/8x100 =100/8 =12又1/2 5分之4 x ...

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