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a)(33,76+6,24)+19,52
=40+19,52
=59,52
b) (\(\frac{38}{11}\)+\(\frac{6}{11}\)) +\(\frac{13}{16}\)
=4+\(\frac{13}{16}\)
=\(\frac{77}{16}\)
\(\frac{3}{5}+\frac{6}{11}+\frac{7}{13}+\frac{2}{5}+\frac{16}{11}+\frac{19}{13}=\left(\frac{3}{5}+\frac{2}{5}\right)\left(\frac{6}{11}+\frac{16}{11}\right)\left(\frac{7}{13}+\frac{19}{13}\right)=1+2+2=5\)
Ta có:3/5+2/5=5/5=1; 6/11+16/11=22/11=2; 7/13+19/13=26/13=2
kết quả là 1+2+2=5
6,24 : 0,5 + 6,24 x 9 - 0,624 : 0,1
= 6,24 x 2 + 6,24 x 9 - 0,624 x 10
= 6,24 x (2 + 9 - 10)
= 6,24 x 1
= 6,24
6,24 : 0,5 + 6,24 x 9 - 0,624 : 0,1
= 6,24 x 2 + 6,24 x 9 - 0,624 x 10
= 6,24 x ( 2+ 9 - 10 )
= 6,24 x 1
= 6,24
a) C1:
7/11 : 3/5 + 4/11 : 3/5 = 7/11 x 5/3 + 4/11 x 5/3
= (7/11 + 4/11) x 5/3
= 1 x 5/3
= 5/3
C2:
7/11 : 3/5 + 4/11 : 3/5 = (7/11 + 4/11) : 3/5
= 1 : 3/5
= 1 x 5/3
= 5/3
b) C1:
(6,24 + 1,26) : 0,75 = 7,5 : 0,75
= 10
C2:
(6,24 + 1,26) : 0,75 = 6,24 : 0,75 + 1,26 : 0,75
= 8,32 + 1,68
= 10
Cách 1
A)(7/11*4/11)*5/3=1*5/3
Cách 2 (7/11*4/11):3/5=1:3/5=5/3
Cách 1
B)7,5:0,75=10
Cách 2
6,24:0,75+1,26:0,75=8,32+1,68
Lời giải bài toán 4/164
a. 64x23+37x23-23
=23x(64+37-1)
=23x100=2300
b. 33,76+19,52+6,24
=(33,76+6,24)+19,52
=40+19,52=59,52
c.38/11+(16/13+6/11)
=38/11+6/11+16/13
=44/11+16/13
=4+16/13=68/13
d. 3/4:3/5-1/5= 5/4-1/5= 21/20
câu 2: 2012:X+23=526
2012:X=503
X=2012:503=4
b.X+9,44=18,36
X= 18,36-9,44=8,92
c. X-3/4=6x1/24
X-3/4=1/4
X=1/4+2/4=1
d. X+2/3= 18:9-1
X+2/3=2-1=1
X= 1-2/3=1/3
câu 3:a) chu vi:350 m
diện tích:7500 m2
b)ko hiểu]
câu 4:tự làm mỏi tay rồi
a/64 x 23 + 37 x 23 - 23 + 6,24
= ( 64 + 37 - 1 ) x 23 + 6,24
= 100 x 23 + 6,24
= 2300 + 6,24
= 2306,24
b/33,76 + 19,52 + 6,24
= ( 33,76 + 6,24 ) + 19,52
= 40 + 19,52
= 59,52
c/\(\dfrac{38}{11}+\left(\dfrac{16}{13}+\dfrac{6}{11}\right)\)
\(=\dfrac{38}{11}+\dfrac{16}{13}+\dfrac{6}{11}\)
\(=\left(\dfrac{38}{11}+\dfrac{6}{11}\right)+\dfrac{16}{13}\)
\(=4+\dfrac{16}{13}\)
\(=\dfrac{52}{13}+\dfrac{16}{13}\)
\(=\dfrac{68}{13}\)
d/\(\dfrac{3}{4}:\dfrac{3}{5}-\dfrac{1}{5}\)
\(=\dfrac{3}{4}\times\dfrac{5}{3}-\dfrac{1}{5}\)
\(=\dfrac{5}{4}-\dfrac{1}{5}\)
\(=\dfrac{25}{20}-\dfrac{4}{20}\)
\(=\dfrac{21}{20}\)
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