Help me Tính nhanh a) 325 x 6 + 6 x 560 + 115 x 6 b) 64 x 25 + 35 x 25 + 25 c) (42 x 43 + 43 x 57 + 43) - 360 : 4 GIẢI CẢ RA NHÉ

a) `325 xx 6 +6 xx 560 + 115 xx 6`

`= (325+560+115) xx 6`

`= 1000 xx 6`

`= 6000`

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b) `64 xx 25 + 35 xx 25 + 25`

`= 64 xx 25 + 35 xx 25 + 1 xx 25`

`= (64+35+1) xx 25`

`= 100 xx 25`

`= 2500`

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c) `(42 xx 43 + 43 xx 57 + 43) - 360:4`

`= (42 xx 43 + 43 xx 57 + 43 xx 1) - 360:4`

`= 43 xx (42+57+1) - 90`

`= 43 xx 100 - 90`

`= 4300-90`

`= 4210`