Maths Question

1) 2+3+5+3x2x3
= 2+3+5+(3x2x3)
= 2+3+5+(6x3)
= 2+3+5+18
= 5+5+18
= 10+18
= 28//

2) 14x1/4+6x2x3
= (14x1/4)+(6x2x3)
= 14/4+12x3
= 14/4+36
= 14/4+144/4
= 158/4
= 37//

3) 14x1/2
1
= 14x------
2
1
= 7x------
1

= 7//

2+3+5+(3x2x3.14x1/4)+(6x2x3.14x1/2)
=10+(3/2 x 3.14) + (6 x 3.14)
=10+((3/2 +6 ) *3.14)
=10 + (15/2 * 3.14)
=10 + (15 * 1.27)
=10+19.05
=29.05

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2 + 3 + 5 + 3 x 2 x 3.14 x 1 / 4 + 6 x 2 x 3.14 x 1 / 2
= 2 + 3 + 5 + ( 3 x 2 x 3.14 x 1 / 4 ) + ( 6 x 2 x 3.14 x 1 / 2 )
= 10 + ( 18.14 / 4 ) + ( 36.14 / 2 )
= 10 + 4.535 + 18.07
= 32.605
= 32.6 (取至三位有效數字)

5+5+3.925+36+7=
10+3.925+36+7=
56.925