51.72+105.12:3.6 4.8x0.75-6.3:3.5
K
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Những câu hỏi liên quan
PK
16
0
PN
2
10 tháng 8 2016
Gọi số cần tìm là a lập biểu thức :
a . 3,5 : 4 = 6,3
=> a.3,5 = 6,3 . 4
=> a.3,5 = 25,2
=> a = 25,2 : 3,5
=> a = 7,2
10 tháng 8 2016
a.3,5:4=6,3
=> a.3,5= 6,3.4
=> a.3,5= 25,2
=> a= 25,2: 3,5
=> a=7,2
NK
0
PA
3
MH
3 tháng 10 2021
a) \(3^6.3^7\) \(=3^{13}\)
b) \(x^{10}:x^6:x\)
\(=x^{10}:x^7\)\(=x^3\)
c) \(a^5.a^9=a^{14}\)
3 tháng 10 2021
\(a,=3^{6+7}=3^{13}\\ b,=x^{10-6-1}=x^3\\ c,=a^{5+9}=a^{14}\\ d,=2^3\cdot2^{15}\cdot2^{16}=2^{34}\\ e,=5^6\cdot5^5\cdot5^5=5^{16}\\ f,=a^{10+4-12}=a^2\)
LT
1
NN
5 tháng 9 2016
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height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300">
CD
1
VT
23 tháng 8 2016
a) 6,3 + (-3,7) + 2,4 + (-0,3)
= (6,3 + 2,4) + [-3,7 + (-0,3)]
= 8,7 + (-4)
= 4,7
b) (-4,9) + 5,5 + 4,9 + (-5,5)
= (-4,9 + 4,9) + [5,5 + (-5,5)]
= 0 + 0
= 0
c) 2,9 + 3,7 + (-4,2) + (-2,9) + 4,2
= [2,9 + (-2,9)] + (-4,2 + 4,2) + 3,7
= 0 + 0 + 3,7
= 3,7
d) (-6,5) . 2,8 + 2,8 . (-3,5)
= 2,8 . [-6,5 + (-3,5)]
= 2,8 . (-10)
= -28.
19 tháng 12 2016
Câu 1 : \(0,36\times630+0,6\times36\times6+3,6\)
\(=0,36\times10\times63+0,6\times6\times36+3,6\)
\(=3,6\times63+3,6\times36+3,6\)
\(=3,6\times\left(63+36+1\right)\)
\(=3,6\times100\)
\(=360\)
Câu 2 :\(3,5\times20,2+6,5\times27,9+3,5\times2,2-6,5\times5,5\)
\(=3,5\times\left(20,2+2,2\right)+6,5\times\left(27,9-5,5\right)\)
\(=3,5\times22,4+6,5\times22,4\)
\(=22,4\times\left(3,5+6,5\right)\)
\(=22,4\times10\)
\(=224\)
\(51\cdot72+105\cdot12:3\cdot6=3672+2520=6192\)
\(4\cdot8\cdot0,75-6\cdot3:3\cdot5=4\cdot8\cdot\frac{3}{4}-6\cdot5=24-30=-6\)
xin t ck
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51,72+105,12:3,6
=51,72+29,2
=80,92
4,8x0,75-6,3:3,5
=3,6-1,8
=1,8