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23 + 23 x 2 + 23 x 3 + 23 x 4
= 23 x (1 + 2 + 3 + 4)
= 23 x 10
= 230
246 x 2005 - 2005 x 148
= (246 - 148) x 2005
= 98 x 2005
= 196490
25 x 12 x 30 x 4
= (25 x 4) x 12 x 30
= 100 x 360
= 36000
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TL:
a)25 x 12 x 30 x 4
= (25 x 5) x (12 x 30)
= 100 x 360
= 36000
b)23 + 23 x 2 + 23 x 3 +23 x 4
= 23 x 1 + 23 x 2 + 23 x 3 +23 x 4
= 23 x (1 + 2 + 3 + 4)
= 23 x 10
= 230
c)248 x 2005 - 2005 x 148
= (248 - 148) x 2005
= 100 x 2005
= 200500
HT
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a. 246 x 2005 - 2005 x 148
= (246 - 148) x 2005
= 98 x 2005
= 196490
b. 25 x 12 x 30 x 4
= (25 x 4) x 12 x 30
= 100 x 360
= 36000
c. 23 + 23 x 2 + 23 x 3 + 23 x 4
= 23 x 1 + 23 x 2 + 23 x 3 + 23 x 4
= 23 x (1 + 2 + 3 + 4)
= 23 x 10
= 230
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a) 25 x 12 x 30 x 4
=(25 x 4 ) x (12 x 30 )
=100 x 360
=3600
b) 23 + 23 x 2 + 23 x 3 + 23 x 4
=23 x 1 +23 x 2 +23 x 3+23 x4
=23 x (1+2+3+4)
=23 x 10=230
c)248 x 2005 - 2005 x 148
=2005 x (248-148)
=2005 x 100
=200500
Hok tốt k nha
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\(12\times x+x\times23=1645\)
\(x\times\left(12+23\right)=1645\)
\(x\times35=1645\)
\(x=1645:35=47\)
12 x X + X x 23 = 1645
X x ( 12 + 23 ) = 1645
X x 35 = 1645
X = 1645 : 35
X = 47
Tick nhé
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TL:
8/15 x 5/6 = 40/90 = 4/9
41/20 x 3/4 = 123/80
(11/23 + 9/23) + (18/23 + 2/23) = 20/23 + 20/23 = 40/43
HT
\(\left(\frac{2}{3}\times\frac{4}{5}\right)\times\frac{5}{6}\) = \(\frac{2}{3}\times\frac{4}{5}\times\frac{5}{6}\)=\(\frac{2\times4\times5}{3\times5\times6}\)=\(\frac{2\times4\times5}{3\times5\times2\times3}\)=\(\frac{4}{9}\)
\(\frac{11}{23}+\frac{2}{23}+\frac{9}{23}+\frac{18}{23}\)=\(\frac{\left(11+9\right)+\left(18+2\right)}{23}\)=\(\frac{20+20}{23}\)=\(\frac{40}{23}\)
\(\frac{27}{12}+\frac{17}{6}-\frac{25}{36}-\frac{15}{6}\)=\(\left(\frac{27}{12}-\frac{25}{36}\right)+\left(\frac{17}{6}-\frac{15}{6}\right)\)=\(\frac{14}{9}+\frac{2}{6}\)=\(\frac{17}{9}\)
/HT\
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\(a.415\times7-415\times5+415\times8\)
\(=415\times\left(7-5+8\right)=415\times10=4150\)
\(b.23\times87+12\times23+23\)
\(=23\times\left(87+12+1\right)=23\times100=2300\)
a. 415 x 7 - 415 x 5 + 4 15 x 8
= 415 x ( 7 - 5 + 8 )
= 415 x 10
= 41 50
b. 23 x 87 + 1 2 x 23 + 2 3
= 23x 87 + 12 x 23 + 23 x 1
= 23 x ( 87 + 12 + 1 )
= 23 x 100
= 2300
=
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a) 415 x 7 - 415 x 5 + 415 x 8
= 415 x (7 - 5 + 8)
= 415 x 10
= 4150
b) 23 x 87 + 12 x 23 + 23
= 23 x 87 + 12 x 23 + 23 x 1
= 23 x (87 + 12 + 1)
= 23 x 100
= 2300
x + 12 = 23
x = 23 - 12
x = 11
k mình nha, mình k lại cho
X+12=23
X=23-12
X=11