﹙0.25a²b－1╱2a³b²－1╱6a^4b³﹚÷﹙﹣0.5a²b﹚

﹙0.25a²b－1╱2a³b²－1╱6a^4b³﹚÷﹙﹣0.5a²b﹚
﹙0.25a²b－1╱2a³b²－1╱6a^4b³﹚÷﹙﹣0.5a²b﹚

﹙0.25a²b－1╱2a³b²－1╱6a^4b³﹚÷﹙﹣0.5a²b﹚
原式=（1/2a^2b÷（-1/2a^2b））+(1/2a^3b^2÷（1/2a^3b^2）)+(1/6a^4b^3÷（1/2a^2b）)
=-1+ab+1/3*a^2b^2
=1/3*a^2b^2+ab-1