## 超急!只限今天,100分!好的再加!(完整形式作答,除了负数除法）a.（-3)/( 6)b.(-5)/(-15)c.( 13)/(-49)d.(-5)-(-2/5)←分数e.(-16)/(-3/4)←

a.（-3)/( 6)
b .(-5)/(-15)
c.( 13)/(-49)
d.(-5)-(-2/5)←分数
e.(-16)/(-3/4)←分数
f.(-40)/(-4/7)←分数
g.(-5/8)/( 8 3/4))←分数.带分数

construct △abc with ab=3cm,bc=2cm and ∠abc is right angle.

the length of a rectangle is 3cm lomger than its width.its perimerter is 42cm.find the length of the rectangle.

a retangle 36cm by 84cm is to be covered with squares which are of the same size.find the largest size of the squares that can be used to exactly cover the rectangle.
bell a is rung at 18-min interval,while bell b is rungat 27-min interval.if they rung together at 12:00 moon ,at what time will they be next rung together?

1.
a.（-3)/( 6)=-1/2
b . (-5)/(-15)=1/3
c. ( 13)/(-49)=-13/49
d. (-5)-(-2/5)←分数=-23/5=-4 3/5(这是-4又3/5)
e. (-16)/(-3/4)←分数=64/3=21 1/3(这是21又1/3)
f. (-40)/(-4/7)←分数=70
g. (-5/8)/( 8 3/4))←分数=-1/14

2. 三角形

3. 方程：

x=12
so the length of the rectangle is 12cm.
4.先给你翻译下题干 用基本运算解下面的题.

a钟每18分钟响一下,b钟每27分钟响一下.如果它们同时在正午12:00的时候敲响,那么下次它们一起敲响是在什么时候?

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