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`= 72 xx 19 + 36 xx 2 xx3 xx 10 + 72 xx 80 - 72 xx 29`
`= 72 xx(19 + 30 - 29 + 80)`
`= 72 xx 100`
`= 7200`
\(=72.19+36.2.3.10+72.2.40-72.29\)
\(=72.19+72.30+72.80-72.29\)
\(=72.\left(19+30+80-29\right)\)
\(=72.100=7200\)
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a: =24*1000=24000
b: =120*1000=120000
c: =72(135+65):25-140
=72*8-140=436
d: =18(957-354-621):72=-9/2
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X x 4 + X x 6=180
X x (4 +6 ) = 180
X x 10 = 180
X = 180:10
X = 18
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C1:
a. 786 x ( 32 +68)
= 786 x 100
= 78600
b. 2904 x 15 + 2904 x 35
= 43560 + 101640
= 145200
c.436 x 72 - 436 x 42
= 31392 - 18312
= 13080
d.194 x (87-7)
= 194 x 80
=15520
e.3332 : (4x49)
= 3332 : 196
= 17
f. 72 : 9 : 8
= (72 : 9) :8
= 1
g. (15 x 24) : 6
= 360 :6
= 60
m. 25 x(36 :9)
= 25 x 4
= 100
Cách 2:
a.786 x 32 + 786 x 68
= 25152 + 53448
= 78600
b. 2904 x ( 15 + 35)
= 2904 x 50
= 145200
c.436 x (72 -42)
= 436 x 30
= 13080
d.194 x 87 - 194 x7
= 16878 - 1358
= 15520
e. 3332 : (4 x 49)
= 3332 : 4 : 49
= 833 : 49 = 17
f. 72 : 9 :8
= 72 : (9 x8)
= 72 : 72
=1
g. (15 x 24) :6
= 15 x (24 :6)
= 15 x 4
= 60
m. 25 x (36 :9)
= ( 25 x36 ):9
= 900 : 9
=100
![](https://rs.olm.vn/images/avt/0.png?1311)
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6/x = 4/6 ; 6/x giữ nguyên 4/6 = 2/3 = 6/9 => x= 9
x/72 = 10/16 ; 10/16 = 5/8 = 45/72 => x = 45
x + 1/6 = 2/3 x = 2/3 - 1/6 = 1/2 => x = 1/2
x - 2/12 = 3/4 x = 3/4 + 2/12 = 11/12
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a, \(\dfrac{72}{x}\) = \(\dfrac{12}{15}\) b 41 - \(\dfrac{x}{24}\) = \(\dfrac{5}{6}\)
\(x\) = 72 : \(\dfrac{12}{15}\) \(\dfrac{x}{24}\) = \(41-\dfrac{5}{6}\)
\(x\) = 90 \(\dfrac{x}{24}\) = \(\dfrac{241}{6}\)
\(x\) = \(\dfrac{241}{6}\) x 24
\(x\) = 964
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Ta có
72+36.2+18.2.6
=36.2+36.2+36.6
=36.(2+2+6)
=36.10
=360
Dấu . là nhân nha
72 ÷ x + 180 ÷ x = 6
( 72 + 180 ) ÷ x = 6
252 ÷x = 6
x = 252 ÷ 6
= 42
ta có:
72 :x+180:x =6
(72+180):x=6
252:x=6
suy ra x=42
vậy x=42