`a) {[ 200 + ( 50 – 30 ) ² ] – 456} : 12` `b) 311 : {210+[53+(37-25).2 ²]}` `c) ( 1/3 + 12/67 + 13/41 ) – ( 79/67 – 28/41 )`

0 bình luận về “`a) {[ 200 + ( 50 – 30 ) ² ] – 456} : 12` `b) 311 : {210+[53+(37-25).2 ²]}` `c) ( 1/3 + 12/67 + 13/41 ) – ( 79/67 – 28/41 )`”

1. `a, {[200+(50-30)^2]-456}:12`

   `={[200+20^2]-456}:12`

   `={[200+400]-456}:12`

   `={600-456}:12`

   `=144:12`

   `=12`

   `b,311:{210+[53+(37-25).2^2]}`

   `=311:{210+[53+12.4]}`

   `=311:{210+[53+48]}`

   `=311:311`

   `=1`

   `c,(1/3+12/67+13/41)-(79/67-28/41)`

   `=1/3+12/67+13/41-79/67+28/41`

   `=1/3+(12/67-79/67)+(13/14+28/41)`

   `=1/3-1+1`

   `=1/3`

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