3.14 times 30?

3.14 times 30?

3.14*30=94.2

(1) If a square ＋ B-2 = 4a-4, find the value of √ AB (2). If a ＜ 3, then the result of simplifying √ a square-6a + 9 + absolute value 4-A is（
(1) If a square ＋ B-2 = 4a-4, find the value of √ ab
(2) If a ＜ 3, the result of simplifying √ a square-6a + 9 + absolute value 4-A is () A. - 1 B.1 c.2a = 7 d.7-20

a²+√(b-2)=4a-4
a²-4a+4+√(b-2)=0
(a-2) ²+√(b-2)=0
Then (A-2) &# 178; = 0, √ (b-2) = 0
a=2,b=2
√ab=√4=2
2. Solution
√(a²-6a+9)+|4-a|
=√(a-3) ²+|4-a|
Because a < 3
If A-3 is less than 0, then √ (A-3) &# 178; = 3-a
4-A ＞ 0, so | 4-A | = 4-a
Original formula = 3-A + 4-A = 7-2a
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