可以帮我检查答案。

Question

1.The perimeter of a square field is 156m.Find the area,in m²,of the field.

A 1521         B 6084      C 312       D 78有颜色的是我的答案，请大家帮我检查。如果有错了请大家教我怎么做？

2.Mark (✓)for the correct relationship and (❌)for the incorrect relationship.

(I)6<√40<7            ❌

（II)0.5<³√0.343<0.8               ✓

可以帮我检查有没有错吗？

Answer 1

这个是我的答案

Answer 2

1. A  (perimeter 156m, means each side is 39m, so area = 39x39 = 1521)

2. (i) and (ii) both correct

the logic is like this

if 6<√40<7  is correct, then 6²<(√40)²<7²   ->   36 < 40 < 49 

similar to (ii)

if 0.5<³√0.343<0.8  is correct, then 

0.5³<(³√0.343)³<(0.8)³  -> 0.125 < 0.343 < 0.512
 

Answer 3

1. Field 的边长=156÷4

                         =39

Area=lengthxwidth

        =39x39

        =39²

        =1521m²

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2. (i) 6<√40<7

6<6.32<7 

Answer: correct

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(ii) 0.5<³√0.343<0.8

0.5<0.7<0.8

Answer: correct

Answer 4

1.156÷4（因为他讲a square feild）=39m

area=39*39=1521m²

^答案：A

2.ⅰ)✓（√40=6.325 ，所以6确实＜√40＜7）

ⅱ)✓³（√0.343=0.7

0.5＜0.7＜0.8）