[1433-122]-1172-325=???
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215 + 43 - 15 - 23
= (215 - 15) + (43 - 23)
= 200 + 20
= 220
2022 - (122 + 2022) + (122 - 325)
= 2022 - 122 - 2022 + 122 - 325
= (2022 - 2022) - (122 - 122) - 325
= 0 - 0 - 325
= - 325
12.(-137) + 12.136
= 12.( -137 + 136)
= 12.(-1)
= - 12
![](https://rs.olm.vn/images/avt/0.png?1311)
mink trả lời trước rùi ai trả lời đúng sau thì mink **** cho nhé
X x 325 = 122 x 125
X x 325 = 15250
X = 15250 : 325
X = 610/13
![](https://rs.olm.vn/images/avt/0.png?1311)
a: =762-325+138+125
=900-200=700
b; =-56(731+70-1)=-56*800=-44800
c: =-671+563-462-129-122
=-1384+563
-821
d: =-342-3485-234-158+3485
=-734
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`@` `\text {Ans}`
`\downarrow`
\(\text{ A = }\dfrac{1}{4\times8}+\dfrac{1}{8\times12}+\dfrac{1}{12\times16}+...+\dfrac{1}{172\times176}\)
\(\text{A = }\dfrac{1}{4}\times\left(\dfrac{4}{4\times8}+\dfrac{4}{12\times16}+...+\dfrac{4}{172\times176}\right)\)
\(\text{A = }\dfrac{1}{4}\times\left(\dfrac{1}{4}-\dfrac{1}{8}+\dfrac{1}{12}-\dfrac{1}{16}+...+\dfrac{1}{172}-\dfrac{1}{176}\right)\)
\(\text{A = }\dfrac{1}{4}\times\left(\dfrac{1}{4}-\dfrac{1}{176}\right)\)
\(\text{A = }\dfrac{1}{4}\times\dfrac{43}{176}\)
\(\text{A = }\dfrac{43}{704}\)
Đáp số: `\text {A =} 43/704.`
( 1433-122)-1172-325
= 1311-1172-325
= 1311-847
= 464