1.(-a^2)(-2ab)=3a^2(ab-1÷3b-1) 2.(-12a^2b^2c)(-1÷4abc^2)^2
问题描述:
1.(-a^2)(-2ab)=3a^2(ab-1÷3b-1) 2.(-12a^2b^2c)(-1÷4abc^2)^2
答
1.(-a^2)(-2ab)+3a^2(ab-1÷3b-1) =2a³b+3a³b-a²b-3a²=5a³b-a²b-3a²2.(-12a^2b^2c)(-1÷4abc^2)^2=-12a²b²c×1/16a²b²c^4=-3/4a^4b^4c^5