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120+[55-(11-3.2)2]+12021
= 120+(55-25)+1
= 120+30-1
= 149
-329+(115-101)-(15-440)
= -329+14+425
= 100
![](https://rs.olm.vn/images/avt/0.png?1311)
Mở máy. Bấm tổ hợp phím:
a) 2 ( 3 x 5 \(x^2\) - 2 ( 5 + 7 ) ) +3 \(x^{[]}\) 3 =
Kết quả:129
b) 3 ( 120 + ( 55 - ( 11 - 3 x 2 ) \(x^2\) ) ) +2 \(x^{[]}\) 3 =
Kết quả: 458
![](https://rs.olm.vn/images/avt/0.png?1311)
Câu 2:
\(a,\Rightarrow x=-23+15=-8\\ b,\Rightarrow5\left(x+4\right)=85\\ \Rightarrow x+4=17\Rightarrow x=13\\ c,\Rightarrow5^{x+2}=24+1=25=5^2\\ \Rightarrow x+2=2\Rightarrow x=0\\ d,\Rightarrow x+4+x+5⋮9\\ \Rightarrow2x+9⋮9\\ \Rightarrow2x⋮9\Rightarrow x\in\left\{0;9\right\}\left(0< x< 10\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(7x-x=5^{120}:5^{117}+3.2^2-7^0\)
\(6x=5^{120-117}+3.4-1\)
\(6x=5^3+12-1\)
\(6x=136\)
\(x=\frac{136}{6}=\frac{68}{3}\)
hok tốt!!
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\(15^2+4.3^2-5.7=225+4.9-35=225+36-35=226\)
\(120-5\left(20-2.3^2\right)=120-5\left(20-2.9\right)=120-5\left(20-18\right)=120-5.2=120-10=110\)
\(2^3.17-14+2^3.2^2=8.17-14+8.4=136-14+32=154\)
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3x+1+2.3x-1=99
=>3x-1(32+2)=99
=>3x-1.11=99
=>3x-1=99:11=9=32
=.x-1=2
=>x=3
Vậy x=3
b,3.2x+2+3.2x=120
=>3.2x(22+1)=120
=>3.2x.5=120
=>3.2x=120:5
=>2x=24:3=8=23
=>x=3
Vậy x=3
=
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1 . 3.2x - 3 = 45
3.2x=45+3
3.2x=48
2x=48:3
2x=16
2x=24
vậy=4
2 . 2448 : [ 119 - ( x - 6 ) ] = 0
119 - ( x - 6 ) = 2448:0
119 - ( x - 6 ) = 0
x-6=0+119
x-6=199
x=199+6
x= 205
3. 4x3 + 12 = 120
4x3 =120-12
4x3 = 108
x3=108:4
x3=27
x3=33
vẫy=3
120+[55-(11-3.2)2]+2
= 120+[55-(11-6)2]+2
= 120+[55-52]+2
= 120+[55-25]+2
= 120+30+2
= 152
152