The topic of the seventh grade in Shanghai mathematics (the topic of the root sign)

1. Because 3 < √ 12 < 4.

So the integer part of √ 12 is 3, and the decimal part is √ 12-3.

So the integer part of 10 -√ 12 a=6.

So the fractional part b =10-(√12-3) =10-√12+3 =13-√12.

2a+b = 12+ 13-√ 12 = 25-√ 12

2. Because 1 < √ 3 < 2

So 0≤4-√3≤2.

So the integer is -2,-1, 0, 1, 2.

2X+ 1 and 3X+4 are opposite numbers because they are two different square roots.

2X+ 1=-3X-4

5X=-5

X=- 1

So this number is 1.