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NA
10 tháng 2 2022
đáy : \(\dfrac{72+8}{2}=40\left(m\right)\)
chiều cao : \(40-8=32\left(m\right)\\ S=40\times32=1220\left(m^2\right)\)
DD
4 tháng 12 2016
a) 267 x 46 + 267 x 54
= 267 x ( 46+ 54)
= 267 x 100
= 26700
b) 369 x 25 + 369 x 74 x 369
= 369 x 25 + 369 x 74 x 369 x 1
= 369 x( 74 +25 +1)
= 369 x 100
=36900
c) 20 x 678 x 5
= ( 20 x 5) x 678
= 100 x 678
= 67800
d) 25 x 8 x 125 x 4
= ( 25 x 4 ) x (125 x 8)
=100 x 1000
= 100000
6 tháng 2 2017
1008/126=8
vì x < 8
nên x=1,2,3,4,5,6,7
23598/874=27
vì y < 27
nên x=1,2,3,4,5,6,7;......;26
LN
6 tháng 2 2017
a) 1008/126= 8
X<8
=> X= 0;1;2;3;4;5;6;7 với X là số tự nhiên
b) 23568/874=27
Y>27
=> Y thuộc N với Y> 27 VD Y= 28;29;30;31;...
k cho mik nha
DV
5
18 tháng 7 2019
\(\frac{637\times527-189}{526\times637+448}\)
\(=\frac{637\times\left(526+1\right)-189}{526\times637+448}\)
\(=\frac{637\times526+637-189}{526\times637+448}\)
\(=\frac{637\times526+448}{526\times637+448}\)
\(=1\)
18 tháng 7 2019
\(\frac{677\times874+251}{678\times874-623}\)
\(=\frac{677\times874+251}{\left(677+1\right)\times874-623}\)
\(=\frac{677\times874+251}{677\times874+874-623}\)
\(=\frac{677\times874+251}{677\times874+251}\)
\(=1\)
NB
1
TM
18 tháng 7 2019
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TQ
3
18 tháng 7 2019
c) 637 x 527 - 189=335510 / 526 x 637 + 448=335510
d) 677 x 874 + 251 =591949 / 678 x 874 - 623=591949
học tốt
18 tháng 7 2019
c, 637x527-189/526x637+448=335918,116
d, 677x874+251/678x874-623=91398,5605
DT
5
TM
18 tháng 7 2019
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XO
28 tháng 1 2020
a) \(\frac{399\times45+55\times399}{1995\times1996-1991\times1995}=\frac{399\times\left(45+55\right)}{1995\times\left(1996-1991\right)}=\frac{399\times100}{1995\times5}=4\)
b) \(\frac{1996\times1995-996}{1000+1996\times1994}=\frac{1996\times\left(1994+1\right)-996}{1000+1996\times1994}=\frac{1996\times1994+1996-996}{1000+1996\times1994}\)
\(=\frac{1996\times1994+1000}{1000+1996\times1994}=1\)
c) \(\frac{637\times527-189}{526\times637+448}=\frac{637\times\left(526+1\right)-189}{526\times637+448}=\frac{637\times526+637-189}{526\times637+448}=\frac{637\times526+448}{526\times637+448}=1\)
d) \(\frac{677\times874+251}{678\times874-623}=\frac{677\times874+251}{874\times\left(677+1\right)-623}=\frac{677\times874+251}{874\times677+874-623}=\frac{677\times874+251}{874\times677+251}=1\)
a) 46 874 – x = 1465
x = 46 874 – 1465
x = 45409
b) x - 1489 = 74 660
x = 74 660+1489
x = 76149