a: =31,378m³

b: =8,15m³

c: =68,45m³

a: =31,378m3

b: =8,15m3

c: =68,45m3

a) 31,378m³

b) 8,15m³

c) 68,45m³

a) 7,528 + 3,16 + 21,05 =  31,738                   b) 34,62 – 26,47    =8,15

c) 18,5 x 3,7 =    68,45                                  d) 29,04: 6,6=4,4

31,738

8,15

 68,45

4,4

\(\text{a) 7,528 + 3,16 + 21,05 = 31,738 }\)

\(\text{b) 34,62 – 26,47 = 8,15}\)

\(\text{c) 18,5 x 3,7 = 68,45}\)

\(\text{d) 29,04: 6,6 = 4,4 }\)

a) 7,528 + 3,16 + 21,05=31,738                      

b) 34,62 – 26,47=8,15

c) 18,5 x 3,7=68,45                                       

d) 29,04: 6,6=4,4

a) 7,528 + 3,16 + 21,05 = 31.738        

b) 34,62 – 26,47 = 8.15

c) 18,5 x 3,7 = 68.45                       
d) 29,04: 6,6 = 4.4

a) 7,528 + 3,16 + 21,05=31,738                      

b) 34,62 – 26,47=8,15

c) 18,5 x 3,7=68,45                                       

d) 29,04: 6,6=4,4

Bài 1: 

a: =25+75=100

b: =60-17-43+12=12

c: =-2-18=-20

d: =-3+36-17=36-20=16

Bài 2: 

a: =-102

b: =-1000

c: =12x15=180

d: =21x(-10)=-210

B1

a 100

b 12

c -20

d 16

B2

a -102

b -1000

c 180

d -210

Bài 1:Tính

 a)(-12)+25+75+12 = 100

b)60+12+(-17)+(-43)=12
c)(-2)+(-87)+(-18)+87=-20
d)(-1)+(-2)+36+(-17)=16
Bài 2:Tính
b)8 . (-125)=-100
c)(-12) . (-15)=180
d)21 . (- 3)+(- 21 ) . 7=-210

87/56

2/3

24/25

28

87/56

2/3

24/25

28

a \(\dfrac{24}{56}+\dfrac{63}{56}=\dfrac{87}{56}\)

b \(\dfrac{12}{15}-\dfrac{2}{15}=\dfrac{10}{15}=\dfrac{2}{3}\)

c \(\dfrac{8}{11}\times\dfrac{33}{5}=\dfrac{24}{5}\)

d \(4:\dfrac{1}{7}=4\times7=28\)

\(A=\left|3,7-x\right|+2,5\ge2,5\)

\(MinA=2,5\Leftrightarrow3,7-x=0\Rightarrow x=3,7\)

\(\left|x+1,5\right|-4,5\ge-4,5\)

\(MinB=-4,5\Leftrightarrow x+1,5=0\Rightarrow x=-1,5\)

\(C=1,5-\left|x+1,1\right|\le1,5\)

\(MinC=1,5\Leftrightarrow x+1,1=0\Rightarrow x=-1,1\)