化简:2a-2{3b-2[a-2b+3(a-c)-2c]-b}
问题描述:
化简:2a-2{3b-2[a-2b+3(a-c)-2c]-b}
答
原式
2a-2(3b-2(a-2b+3a-3c-2c)-b)
=2a-2(3b-2(4a-2b-5c)-b)
=2a-2(3b-8a+4b+10c-b)
=2a-(6b-16a+8b+20c-2b)
=2a-(12b-16a+20c)
=2a-12b+16a-20c
=18a-12b-20c