999-532-123
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 36 x 532 + 63 x 532 + 532
= 532 x (36 + 63 + 1)
= 532 x 100
= 53200
b) 679 + 679 x 123 - 679 x 24
= 679 x (1 + 123 - 124)
= 679 x 0
= 0
c) 245 x 327 - 245 x 18 - 9 x 245
= 245 x (327 - 18 - 9)
= 245 x 300
= 73500
a)
\(36\times532+63\times532+532\)
\(=36\times532+63\times532+532\times1\)
\(=532\times\left(36+63+1\right)\)
\(=532\times100\)
\(=53200\)
b)
\(679+679\times123-679\times24\)
\(=679\times1+679\times123-679\times24\)
\(=679\times\left(1+123-24\right)\)
\(=679\times100\)
\(=67900\)
c)
\(245\times327-245\times18-9\times245\)
\(=245\times\left(327-18-9\right)\)
\(=245\times300\)
\(=73500\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(A=\frac{\frac{4}{111}+\frac{4}{123}-\frac{4}{999}}{\frac{2}{111}+\frac{2}{123}+\frac{2}{999}}\)
\(=\frac{4.\left(\frac{1}{111}+\frac{1}{123}+\frac{1}{999}\right)}{2.\left(\frac{1}{111}+\frac{1}{123}+\frac{1}{999}\right)}\)
\(=\frac{4}{2}=2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{\frac{4}{111}+\frac{4}{123}+\frac{4}{999}}{\frac{2}{111}+\frac{2}{123}+\frac{2}{999}}=\frac{4.\left(\frac{1}{111}+\frac{1}{123}+\frac{1}{999}\right)}{2.\left(\frac{1}{111}+\frac{1}{123}+\frac{1}{999}\right)}=\frac{4}{2}=2\)
\(=\frac{2\left(\frac{2}{111}+\frac{2}{123}+\frac{2}{999}\right)}{\frac{2}{111}+\frac{2}{123}+\frac{2}{999}}\)
\(=2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Khi đổi chỗ các số hạng trong một tổng thì tổng đó không thay đổi.
Do đó, 123+999+472=472+123+999
Vậy đáp án đúng điền vào ô trống là 999.
![](https://rs.olm.vn/images/avt/0.png?1311)
( 1/99 + 12/999 + 123/999 ) . ( 1/2 - 1/3 - 1/6 )
= ( 1/99 + 12/999 + 123/999 ) . 0
= 0 nha bn
![](https://rs.olm.vn/images/avt/0.png?1311)
q = (1/99+12/999+123/999)*(1/2-1/3-1/6)
= (1/99+12/999+123/999) * 0
= 0
![](https://rs.olm.vn/images/avt/0.png?1311)
\(Q=\left(\frac{1}{99}+\frac{12}{999}+\frac{123}{999}\right).\left(\frac{1}{2}-\frac{1}{3}-\frac{1}{6}\right)\))
\(Q=\left(\frac{1}{99}+\frac{12}{999}+\frac{123}{999}\right).0=0\)
999-532-123=344