3.22 nha :)))
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\(\left\{210:\left[16+3.\left(6+3.22\right)\right]\right\}-3\)
\(=\left\{210:\left[16+3.\left(6+66\right)\right]\right\}-3\)
\(=\left\{210:\left[16+3.72\right]\right\}-3\)
\(=\left\{210:\left[16+216\right]\right\}-3\)
\(=\left\{210:232\right\}-3\)
\(=\dfrac{105}{116}-3\)
\(=\dfrac{-243}{116}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(7x-x=5^{21}:5^{19}+3.2^2-7^0\)
\(6x=5^2+3.2-1\)
\(6x=25+12-1\)
\(6x=36\)
\(x=6\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Đáp án A
y = x + x 2 + x 3 + ... + x 2018 = x 1 − x 2018 1 − x y ' = 1 + 2 x + 3 x 2 + ... + 2018 x 2017 = 2018 x 2019 − 2019 x 2018 + 1 ( 1 − x ) 2 y ' ( 2 ) = 1 + 2.2 + 3.2 2 + ... + 2018.2 2017 = 2017.2 2018 + 1
a) 232 - (581 + 132 - 331)
= 232 - 581 - 132 + 331
= (232 - 132) - (581 - 331)
= 100 - 250
= - (250 – 100)
= - 150
b) [12 + (-57)] - [- 57 - (-12)]
= (12 – 57) – (- 57 + 12)
= 12 - 57 + 57 - 12
= (12 – 12) + (57 – 57)
= 0 + 0
= 0
a) 232 - (581 + 132 - 331)
= 232 - 581 - 132 + 331
= (232 - 132) - (581 - 331)
= 100 - 250
= - (250 – 100)
= - 150
b) [12 + (-57)] - [- 57 - (-12)]
= (12 – 57) – (- 57 + 12)
= 12 - 57 + 57 - 12
= (12 – 12) + (57 – 57)
= 0 + 0
= 0