|a-1|+(b-2)2=0 求3a2-[4a2b-5(ab2+2a2b)-2ab2]

题目

|a-1|+(b-2)2=0 求3a2-[4a2b-5(ab2+2a2b)-2ab2]

答案

∵|a-1|+(b-2)2=0∴a-1=0 且 b-2=0a=1,b=23a²-[4a²b-5(ab²+2a²b)-2ab²]=3a²-4a²b+5(ab²+2a²b)+2ab²=3a²-4a²b+5ab²+10a²b+2ab²=3a²...