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12 x 34 + 6 x 2 x 54 + 3 x 4 x 12
= 12 x 34 + 12 x 54 + 12 x 12
= 12 x ( 34 + 54 + 12 )
= 12 x 100
= 1200
12x34+6x2x54+3x4x12
=12x34+12x54+12x12
=12x(34+54+12)
=12x100
=1200
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A = 72+139+195+216
=622
B=54 x 63 + 54 x 67 - 54 x 40
= 54 x ( 63+67-40)
= 54 x 90 = 4860
A=72+139+195+216
A=(72+139)+(195+216)
A=211+411)
A=622
B=54x63+54x67-54x40
B=54x(63+67-40)
B=54x90
4860
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8 giờ 40 phút x 3 + 6 giờ 54 phút : 3 - 8.3 giờ
24 giờ 120 phút + 2 giờ 16 phút - 8.3 giờ
26 giờ 136 phút - 8.3 giờ
18 giờ 116 phút đó
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\(12,45\times x-0,45\times x+x=3,9.\)
\(\Leftrightarrow x\times\left(12,45-0,45+1\right)=3,9.\)
\(\Leftrightarrow x\times13=3,9.\)
\(\Leftrightarrow x=0,3.\)
Vậy \(x=0,3.\)
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a, 4 x 113 x 8 - 32 x 13
= (4 x 8) x 113 - 32 x 13
= 32 x 113 - 32 x 13
= 32 x (113 - 13)
= 32 x 100 = 3200
b , 54 x 227 + 45 x 227 + 227
= 227 x (54+45+1)
= 227 x 100
= 22 700
c, ( 145 x 99 + 145 ) - ( 143 x101 - 143 )
= 145 x (99+1) - 143 x (101 - 1)
= 145 x 100 - 143 x 100
= 100 x (145 - 143)
= 100 x 2
= 200
a) \(4\times113\times8-32\times13\)
\(=4\times8\times113-32\times13\)
\(=32\times113-32\times13\)
\(=32\times\left(113-13\right)\)
\(=32\times100\)
\(=3200\)
b) \(54\times227+45\times227+227\)
\(=227\times\left(54+45+1\right)\)
\(=227\times100\)
\(=22700\)
c) \(\left(145\times99+145\right)-\left(143\times101-143\right)\)
\(=145\times\left(99+1\right)-143\left(101-1\right)\)
\(=145\times100-143\times100\)
\(=14500-14300\)
\(=200\)
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32 x 1,25 x 25 x (54/10 x 8,7 + 5,4 x 3,3 - 10,8)
= (32 x 25) x 1,25 x (5,4 x 8,7 + 5,4 x 3,3 - 10,8)
= 800 x 1,25 x (5,4 x 8,7 + 5,4 x 3,3 - 5,4 x 2)
= 1000 x [ 5,4 x (8,7 + 3,3 - 2) ]
= 1000 x (5,4 x 10)
= 1000 x 54
= 54000
k mik nha bn
54 x 41 x 54 x 12
=2214x648
=1434672
=2214x648
=1434672