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79x54+54x38-18x3
=54x(79+38) - 18x3
kết quả bạn tự tính nha mk ko biết có đúng hay ko
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a) ( a+18) x 3 : 6 + 70 = 130
( a+ 18) x 3 : 6 = 130 - 70 = 60
( a+18) x 3 = 60 x 6 =360
a + 18 = 360 : 3 = 120
a = 120 - 18 =102
b) ( a + 18 x 3) : 6 + 70 = 130
( a+ 18 x 3) : 6 = 130 - 70 =60
a + 18 x 3 = 60 x 6 = 360
a + 18 = 360 : 3 = 120
a = 120 - 18 = 102
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=2008x1+2008x1+2008x1+2008x1-2008x4
=2008x(1+1+1+1-4
=2008x0
=0
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45 x 22 + 45 x 18
= 45 x ( 18+ 22)
= 45 x 40
= 1000
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Đặt :
\(A=\frac{1}{3.5}+\frac{1}{5.7}+\frac{1}{7.9}+\frac{1}{9.11}\)
\(\Rightarrow2A=\frac{2}{3.5}+\frac{2}{5.7}+\frac{2}{7.9}+\frac{2}{9.11}\)
\(\Rightarrow2A=\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+\frac{1}{7}-\frac{1}{9}+\frac{1}{9}-\frac{1}{11}\)
\(\Rightarrow2A=\frac{1}{3}-\frac{1}{11}\)
\(\Rightarrow2A=\frac{3}{11}\)
\(\Rightarrow A=\frac{3}{22}\)
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18/21 +19/32 +3/21+13/32
= (18/21 + 3/21) + (19/32 + 13/32)
= 1 + 1=2
79x54+54x38-18x3
= 79x54+54x38-54
=54x(79+38-1)
=54x116
=6264
79 x 54 + 54 x 38 - 18 x 3
= 79 x 54 + 38 x 54 - 54 x 1
= ( 79 + 38 - 1 ) x 54
= 116 x 54
= 16 + 100 x 54
= 16 + 5400
= 5416