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`a,3^3 .4^3 + 4^3 .7^3`
`= 4^3 .(3^3 + 7^3)`
`= 64 .( 3^3 + 7^3 )`
`= 64 .( 27 + 343 )`
`= 64 .370`
`= 23680`
`b, 5^2 .2^2 + 4^5 : 4^3 - 3^0`
`= 25 .4 + 4^2 - 3^0`
`= 100 + 16 - 1`
`= 115`
`c, 2^9 : 2^7 + 2.[ 3^3 + ( 2^2 - 1^3 ) 2]`
`= 2^9 : 2^7 + 2.[ 3^3 + ( 4 - 1 ) 2]`
`= 2^9 : 2^7 + 2.( 3^3 + 3.2)`
`= 2^9 : 2^7 + 2.( 27 + 6 )`
`= 2^2 + 2.33`
`= 4 + 66`
`= 70`
`d, 2^9 : 2^7 + 2.[ 15^2 -( 3^3 - 2^4) 2]`
`= 2^9 : 2^7 + 2.[ 15^2 -(27 - 16) 2]`
`= 2^9 : 2^7 + 2.( 15^2 - 11.2 )`
`= 2^9 : 2^7 + 2.( 225 - 22 )`
`= 2^9 : 2^7 + 2.203`
`= 2^2 + 2.203`
`= 4 + 2.203 `
`= 4 + 406`
`= 410`