计算:2a²-2(a²-2ab)-4ab

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计算:2a²-2(a²-2ab)-4ab
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计算:2a²-2(a²-2ab)-4ab
计算:2a²-2(a²-2ab)-4ab

计算:2a²-2(a²-2ab)-4ab
2a²-2(a²-2ab)-4ab
=2a²-2a²+4ab-4ab
=(2a²-2a²)+(4ab-4ab)
=0+0
=0

2a²-2(a²-2ab)-4ab
=2a²-2a²+4ab-4ab
=0

这还要什么过程。把括号开开不就都解决了

原式=2a²-2a²+4ab-4ab
=0