化简:2a-2{3b-2[a-2b+3(a-c)-2c]-b}

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化简:2a-2{3b-2[a-2b+3(a-c)-2c]-b}化简:2a-2{3b-2[a-2b+3(a-c)-2c]-b}化简:2a-2{3b-2[a-2b+3(a-c)-2c]-b}原式2a-2(

化简:2a-2{3b-2[a-2b+3(a-c)-2c]-b}
化简:2a-2{3b-2[a-2b+3(a-c)-2c]-b}

化简:2a-2{3b-2[a-2b+3(a-c)-2c]-b}
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

18a-12b-20c