Giải giúp em với ạ cảm ơn

Bài ` 1 : `

` C = 225/75 xx 225/675 - 1/3 xx 1/3 `

` C = 3 xx 1/3 - 1/3 xx 1/3 `

` C = 1 - 1/9 `

` C = 8/9 `

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` D = 144/156 xx 13/144 xx 12 `

` D = 12/13 xx 13/144 xx 12 `

` D = ( 12 xx 13 xx 12 )/( 13 xx 144 ) `

` D = ( 144 xx 13 )/( 13 xx 144 ) `

` D = 1 `

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` E =  2/176 : 5/165 : 75/100 `

` E = 2/176 xx 165/5 xx 100/75 `

` E = 1/88 xx 33 xx 4/3 `

` E = ( 1 xx 33 xx 4 )/( 88 xx 3 ) `

` E = ( 1 xx 11 xx 1 )/( 22 xx 1 ) `

` E = 1/2 `

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