先化简,在求值 -1⼀2a-2(a-1⼀2b²)-(3⼀2a-1⼀3b²)其中a=-2,b=2⼀3 2a²-{-3a+5[4a²-(3a&s

2024-12-30 16:18:41
推荐回答(2个)
回答1:

-1/2a-2(a-1/2b²)-(3/2a-1/3b²)
=-4a+4/3b²
=8+4/3*4/9
=8+16/27
???

回答2:

nicai