Page 18 - Calculas I
P. 18
II. จงหา โดยใช้สูตร
4
5
4
1. ก าหนดให้ = ( + 2) + 5 ( +2) จงหาค่าของ
= [( + 2) ] + [5 +2
4
4
5
]
4
4
4
4
= 5( + 2) 4 [ + 2] + 5 +2 ln 5 ( + 2)
4
4
3
4
3
= 5( + 2) (4 ) + 5 +2 ln 5 (4 )
4
3
4
4
= 20 (( + 2) + 5 +1 ln 5)
√ −2
2. [ ] = [1 − 2√ ]
√
= [1] − [2√ ]
1 1
= 0 − 2 ( ) = −
2√ √
2
3
3. ก าหนดให้ = ( 4 − 1)(7 + )จงหา /
2 3
[(4 − 1)(7 + )]
3
2
3
2
= (4 − 1) [7 + ] + (7 + ) [4 − 1]
3
2
2
= (4 − 1)(21 + 1) + (7 + )(8 )
2
4
2
4
2
= 84 + 4 − 21 − 1 + 56 + 8
2
4
= 140 − 9 − 1
2 3 5 3 3
[(4 − 1)(7 + )] = [28 + 4 − 7 − ]
3
5
= [28 − 3 − ]
2
4
= 140 − 9 − 1
18
