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\(697:\frac{15x+364}{x}=17\)
\(\frac{15x+364}{x}=697:17=41\)
\(\frac{15x}{x}+\frac{364}{x}=41\)
\(15+\frac{364}{x}=41\)
\(\frac{364}{x}=41-15=26\)
\(x=364:26=14\)
\(92.4-27=\frac{x+350}{x}+315\)
\(\frac{x+350}{x}+315=341\)
\(\frac{x+350}{x}=341-315=26\)
\(\frac{x}{x}+\frac{350}{x}=26\)
\(1+\frac{350}{x}=26\)
\(\frac{350}{x}=26-1=25\)
\(x=350:25=14\)
a , (x+1)+(x+2)+....+(x+100)=5750
x . 100 + ( 1+2+..+100 ) = 5750
x . 100 + 5050 = 5750
x . 100 = 700
x = 700 ; 100
x = 7
a) \(697:\frac{15X+364}{X}=17\)
\(\Rightarrow\frac{15X+364}{X}=697:17=41\)
\(\Rightarrow15X+364=41X\)
\(\Rightarrow364=41X-15X=26X\)
\(\Rightarrow X=14\)
697:(15x+364):x=17
=> 15+360:x = 697:17=41
=> 360:x=41-15=26
=> x=360:26=180/13
92.4-27=(x+350):x+315
=> 1+350:x+315=341
=> 350:x = 341 -316=25
-> x=350:25=14
720:(41-(2x-51)=23.5
=> 41-(2x-51)= 720 :40=18
=> 2x=41-18+51=74
=> x=74:2=37
(x+1)+(x+2)+(x+3)+...+(x+100)=5750
=>(x+x+...+x) +(1+2+3+..+99+100)=5750
=> 100.x +(100+1).100:2= 5750
=>100.x= 5750-5050=700
=> x=700:100=7
( L-i-k-e )
697 : (15x + 364) : x = 17
=> 15 + 360 : x = 697 : 17 = 41
=> 360 : x = 41 - 15 = 26
=> x = 360 : 26 = 180/13
92.4 - 27 = (x + 350) : x + 315
=> 1 + 350 : x + 315 = 341
=> 350 : x = 341 - 316 = 25
-> x = 350: 25 = 14
720 : (41 - (2 x - 51) = 23.5
=> 41 - (2 x -51) = 720 : 40 = 18
=> 2x = 41 - 18 + 51 = 74
=> x = 74 : 2 = 37
(x + 1) + (x + 2) + (x + 3) +...+ (x + 100) = 5750
=>(x + x +...+ x) +(1 + 2 + 3 +...+ 99 + 100) = 5750
=> 100.x + (100 + 1).100 : 2 = 5750
=>100.x = 5750 - 5050 = 700
=> x = 700 : 100 = 7
1990.1990-1992.1998
=1990.1990-(1990+2).1998
=1990.1990-1990.1998+2.1998
=1990.(1990-1998)+2.1998
=1990.(-8)+2.1998
=1990.(-8)+2.(1990+8)
=1990.(-8)+2.1990+16
=1990.{(-8)+2}+16
=1990.(-6)+2.8
=(-1990).3.2+2.8
=-5970.2+2.8
=2.{(-5970)+8}
=2.-5962
=−11924
Bài 1:
a.1990.1990-1992.1988
Gọi 1990 là a ta có:
1992=a+2
1988=a-2
\(\Rightarrow A=a^2-\left(a+2\right)\left(a-2\right)\)
\(\Rightarrow A=a^2-a^2-2a+2a-4\)
\(\Rightarrow A=-4\)