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\(16+4x=210:26\\ 16+4x=\dfrac{105}{13}\\ 4x=\dfrac{105}{13}-16\\ 4x=-\dfrac{103}{13}\\ x=-\dfrac{103}{13}:4\\ x=-\dfrac{103}{52}\)
16 + 4\(x\) = 210 : 26
16 + 4\(x\) = \(\dfrac{105}{13}\)
4\(x\) = \(\dfrac{105}{13}\) - 16
4\(x\) = - \(\dfrac{103}{13}\)
\(x\) = - \(\dfrac{103}{13}\) : 4
\(x\) = - \(\dfrac{103}{52}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left\{210:\left[16+3.\left(6+3.22\right)\right]\right\}-3\)
\(=\left\{210:\left[16+3.\left(6+66\right)\right]\right\}-3\)
\(=\left\{210:\left[16+3.72\right]\right\}-3\)
\(=\left\{210:\left[16+216\right]\right\}-3\)
\(=\left\{210:232\right\}-3\)
\(=\dfrac{105}{116}-3\)
\(=\dfrac{-243}{116}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left\{210:\left[16+3\cdot\left(6+3\cdot2^2\right)\right]\right\}\)
\(=210:\left[16+3\cdot\left(6+3\cdot4\right)\right]\)
\(=210:\left[16+3\cdot\left(6+12\right)\right]\)
\(=210:\left(16+3\cdot18\right)\)
\(=210:\left(16+54\right)\)
\(=210:70\)
\(=3\)
#Urushi
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 15 + 16 + 17 ... + 122+123
Có số số hạng là :
(123-15):1+1=108 ( số )
Tổng của dãy trên là :
(123+15)x108:2=7452
b, 14+16+18+...+210+212
Dãy trên có số số hạng là :
(212-14):2+1=100 ( số )
Tổng của dãy trên là :
(212+14) x 100 : 2 = 11300
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left\{210:\left[16+3.\left(6+3.2^2\right)\right]\right\}-3\)
\(=\left\{210:\left[16+3.\left(6+3.4\right)\right]\right\}-3\)
\(=\left\{210:\left[16+3.\left(6+12\right)\right]\right\}-3\)
\(=\left\{210:\left[16+3.18\right]\right\}-3\)
\(=\left\{210:\left[16+54\right]\right\}-3\)
\(=\left\{210:70\right\}-3\)
\(=3-3\)
\(=0\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left\{210:\left[16+3.\left(6+3.2^2\right)\right]\right\}-3\)
\(=\left\{210:\left[16+3.\left(6+12\right)\right]\right\}-3\)
\(=\left\{210:\left[16+3.18\right]\right\}-3\)
\(=\left\{210:\left[16+54\right]\right\}-3\)
\(=\left\{210:70\right\}-3=3-3=0\)
210+[16+(-210)-16]
=[210+(-210)]+[16+(-16)]
=0+0
=0
k mk nhe
= [ (-210)+210]+(16-16)
= 0 + 0
= 0