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Math in the sixth grade is a problem for you.
One,

1、5/4; 4/5

2、 1/ 10

3、9; 27

Second,

Right; Right; wrong

Third,

1, 33% is the maximum, and three tenths is equal to 0.3.

2、A; 3、B; 4、D

Fourth,

Trapezoidal area-quarter circle area:

1/2*8*(8+ 10)- 1/4*π8? =72- 16*3. 14

Five,

1、x+3x/4=420 ->7x/4=420 ->x=240

2、 120*3/4=3x/ 10 ->x=90/0.3=300

3. Suppose A has original X yuan and B has 0.8x yuan.

x-45/0.8x+45 = 5/7->; x = 180; So, the result is that A has 180 yuan and B has 144 yuan.

5. To make the circular saw the largest square, the diameter of the circle should be the diagonal of the square (the square can be regarded as the combination of four equal right triangles).

Circle radius r=376.8/2π

So, the area of the square is: r? /2 (area of triangle) *4