6, 789 - 5,620 = ........
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a) -24 + 13 + 6 + 24
= 24 + (-24) + 13 +6
= 0+13+6
= 19
b ) 28 + ( -6 ) - 50 + 6
= 6 + (-6 ) + 28 -50
= 0 +28 - 50
= 28 -50
= -22
a) ( -24 + 24) + 13 + 6 = 19
b) 28 - 50 + ( -6 + 6) = -22
c) ( -27 - 73 ) + (-789 + 789) + 9 = -91
d) {[ -23 + ( -17) ] - 10} + 50 = -50 + 50 = 0
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\(x+6+6+7=789\)
\(x+\left(6+6+7\right)=789\)
\(x+19=789\)
\(x=789-19\)
\(x=770\)
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a ) - 24 + 13 + 6 +24
= [(-24) + 24 ] + 13 + 6
= 0 + 13 + 6
= 19
b) 28 + (-6) - 50 + 6
= 22 - 56
= - 34
c) - 27 + ( -789 ) + ( -73 ) +789
= [ (-789) + 789 ] + [ ( - 27 ) + ( -73) ]
= 0 + (-100)
= -100
d) (-23) + ( - 17 ) + 50 +(-10)
= [ ( -23 ) + ( -17 ) + ( -10) ] + 50
= ( -50 ) + 50
= 0
e) 1998+ (-72) + ( -1998 ) + 72
= [ 1998 + ( -1998 ) ] + [ (-72) + 72 ]
= 0 + 0
= 0
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(789.6^2-1532.18\right):\left(18.23\right)\)
\(=\left(789.36-1532.18\right):\left(18.23\right)\)
\(=\left(28404-27576\right):\left(414\right)\)
\(=828:414\)
\(=2\)
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Tính:
\(2448:\left[119-\left(23-6\right)\right]\)
\(=2448:\left[119-17\right]\)
\(=2448:102\)
\(=24\)
___________________________
\(\left\{789+\left[324:\left(78-66\right)\right]\right\}+273\)
\(=\left\{789+\left[324:12\right]\right\}+273\)
\(=\left\{789+27\right\}+273\)
\(=816+273\)
\(=1089\)
Chúc bạn học tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
Áp dụng tính chất giao hoán của phép cộng ta có:
? + 2 895 = 2 895 + 6 789. Suy ra "?" có giá trị 6 789
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1 + 2 + 3 + 6 + 7 + 98 + 16 + 789 + 45 + 616
= 3 + 3 + 6 + 7 + 98 + 16 + 789 + 45 + 616
= 6 + 6 + 7 + 98 + 16 + 789 + 45 + 616
= 12 + 7 + 98 + 16 + 789 + 45 + 616
= 19 + 98 + 16 + 789 + 45 + 616
= 117 + 16 + 789 + 45 + 616
= 133 + 789 + 45 + 616
= 922 + 45 + 616
= 967 + 616
= 1583
Chúc bạn may mắn nhìu nha!
![](https://rs.olm.vn/images/avt/0.png?1311)
6, 789 - 5,620 = 1,169
6, 789 - 5,620 =
= 1,169
~HT~