2ab—4a^2b^3+o.4a^3b—3ab+6a^2b^3—5.4a^3b,其中a=0.5b=-3/2

问题描述:

2ab—4a^2b^3+o.4a^3b—3ab+6a^2b^3—5.4a^3b,其中a=0.5
b=-3/2

ab=0.5*(-3/2)=-3/4
2ab—4a^2b^3+o.4a^3b—3ab+6a^2b^3—5.4a^3b
=2ab-3ab-4a²b³+6a²b³+0.4a³b-5.4a³b
=-ab+2a²b³-5a³b
=-(-3/4)+2*(ab)²*b-5(ab)a²
=3/4+2(-3/4)²*(-3/2)-5(-3/4)(1/2)²
=3/4-2*9/16*3/2+15/16
=3/4-27/16+15/16
=3/4-12/16
=3/4-3/4
=0