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16 x 80 + 16 x 20
= 16 x ( 80 + 20 )
= 16 x 100
= 1600 k mk,mk sẽ k lại bn!
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{5}{16}=\frac{5.5}{16.5}=\frac{25}{80}\)
\(\frac{7}{20}=\frac{7.4}{20.4}=\frac{28}{80}\)
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a: =24/15-18/15=6/15=2/5
b: =78/42-24/42=54/42=9/7
c: =30/36-12/36=18/36=1/2
d: =7/8-1/8-3/34=6/8-3/34=3/4-3/34=45/68
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1237 x (12 + 34 + 1 + 53)
= 1237 x 100
= 123700
(100-99+97-80+15) x (16 - 16)
= 0 x (100-99+97-80+15) =0
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Lời giải:
a.
$18\times 85+9\times 30=18\times 85+18\times 15=18\times (85+15)$
$=18\times 100=1800$
b.
$9\times 13+9\times 80+63=9\times 13+9\times 80+9\times 7$
$=9\times (13+80+7)=9\times 100=900$
c.
$8\times 11+16\times 40+72=8\times 11+8\times 80+8\times 9$
$=8\times (11+80+9)=8\times 100=800$
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a.18\times85+9\times30\)
\(\text{=}1530+270\)
\(\text{=}1800\)
\(b.9\times13+9\times80+63\)
\(\text{=}117+720+63\)
\(\text{=}900\)
\(c.8\times11+16\times40+72\)
\(\text{=}88+640+72\)
\(\text{=}800\)
![](https://rs.olm.vn/images/avt/0.png?1311)
16 x 80 + 16 x 19 + 16
= 16 x ( 80 + 19 + 1 )
= 16 x 100
= 1600
CHÚC BẠN HỌC TỐT !
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a. … = 80 : (4 x 10)
= 80 : 4 : 10
= 20 : 10 = 2
b. … = 150 : (10 x 5)
= 150 : 10 : 5
= 15 : 5 = 3
c. … = 80 : (8 x 2)
= 80 : 8 : 2
= 10 : 2 = 5
=5x7
=35