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3 x 17 = 3 x (10 + 7) = 3 x 10 + 7 x 3 = 30 + 21 = 51
4 x 25 = 4 x (10 + 15) = 4 x 10 + 15 x 4 = 40 + 60 = 100
5 x 12 = 5 x (10 + 2) = 5 x 10 + 5 x 2 = 50 + 10 = 60
ủng hộ nhé
3 x 17 = 3 x ( 10 + 7 ) = 3 x 10 + 3 x 7 = 30 + 21 = 51
4 x 25 = 4 x ( 10 + 15 ) = 4 x 10 + 4 x 15 = 40 + 60 = 100
5 x 12 = 5 x ( 10 + 2 ) = 5 x 10 + 5 x 2 = 50 + 10 = 60
k mk nếu đúng nha bn
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`687 + (2 × 5) + 10`
`= 687 + 10 + 10`
`= 697 + 10`
`= 707`
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1.100x15+85x100
=1500+8500
=10000
2.100x198-100x98
=19800-9800
=10000
3.50+5-15+10
=55-25
=30
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5 . 10 + 7 . 10 - 10 . 2
= 10 . ( 5 + 7 - 2 )
= 10 . 10
= 100
Đúng 100%
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**5+x=10
\(\Rightarrow x=10-5\)
\(\Rightarrow x=5\)
Vậy x=5
**9+x=12
\(\Rightarrow x=12-9\)
\(\Rightarrow x=3\)
Vậy x=3
**18:x=6
\(\Rightarrow x=18:6\)
\(\Rightarrow x=3\)
Vậy x=3
5 + x = 10
x = 10 - 5
x = 5
9 + x = 12
x = 12 - 9
x = 3
18 : x = 6
x = 18 : 6
x = 3
^ - ^
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12 : 3 = 4 x 4 = 16
20 x 3 = 60
90 : 1 = 90
123 - 123 = 0
10 x 9 = 90 : 9 = 10
12 - 9 = 3 x 9 = 27
23 - 5 = 18
123 + 12 = 135
1000 - 200 = 800
333 - 111 = 222
\(20.3=60\)
\(90.1=90\)
\(123-123=0\)
\(10.9=\frac{810}{9}=90\)
\(23-5=15\)
\(123+12=135\)
\(1000-200=800\)
\(333-111=222\)
100
100
24
25
two
50 x 20 = 100
10 x 10 = 100
12 x 2 = 24
5 x 5 = 25
one + one = two