(3a+1)(2a+3)-6(a-1)(a+2)其中a=-3,

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/29 21:22:10
(3a+1)(2a+3)-6(a-1)(a+2)其中a=-3,
x){8QPS(QXSL#QI6|ںɎ:6IED/!T[D#{ =A $cdk MmB~qAbR00⌴6i낙f@F)Cs 5քuM lc3*جd)b]CS8LBnatdPd<X \5J{ $7V@Vso݋.}a㋅=Ov)<7]Y9}(

(3a+1)(2a+3)-6(a-1)(a+2)其中a=-3,
(3a+1)(2a+3)-6(a-1)(a+2)其中a=-3,

(3a+1)(2a+3)-6(a-1)(a+2)其中a=-3,
=6a²+11a+3-6a²-6a+12=5a+15=-15+15=0

(3a+1)(2a+3)-6(a-1)(a+2)
=6a^2+11a+3-6a^2+6a+12
=17a+15
=17*(-3)+15
=-51+15
=-36

(3a+1)(2a+3)-6(a-1)(a+2)
=6a^2+11a+3-6a^2-6a+12
=5a+15
=-15+15
=0

(3a+1)(2a+3)-6(a-1)(a+2)
=6a²+11a+3-6a²-6a+12
=5a+15
当a=-3时,
5a+15=-15+15=0

(3a+1)(2a+3)-6(a-1)(a+2)
=6a²+11a+3-6a²-6a+12
=5a+15
当a=-3时
5a+15=5x(-3)+15= -15+15=0

直接代入就行了 得 0