Rezolvati ecuatiile...

a)9x+28=2755;
510+14x=762;
b)5y-97=943;
410-7y=151;
c)3(x+7)=75;
14(12-x)=70;
d)(82+y)/6=17;
(y-33)/9=305
e)111+2x+29=,10 la puterea a 3;
5x+52-31=,30 la puterea a 2, -19;
f)5(y-2)+3=38;
9+2(14-y)=15

2

Răspunsuri

2014-10-22T17:55:04+03:00
a ) 9x = 2755 - 28 ==> 9x = 2727 ==> x = 2727 / 9 = 303
     14x = 762 - 510 ==> 14x = 252 ==> x = 252 / 14 = 18
b ) 5y = 943 + 97 ==> y = 1040 / 5 = 208
     7y = 410 - 151 ==> y = 259 / 7 = 37
c ) 3x = 75 - 21 ==> 3x = 54 ==> x = 18
     168 - 14x = 70 ==> 14x = 168 - 70 ==> x = 98 / 14 = 7
d ) 82 + y = 102 ==> y = 20
     y - 33 = 2745 ==> y = 2778
e ) 2x = 1000 - 111 - 29 ==> x = 860 / 2 = 430
     5x = 900 - 19 - 52 + 31 ==> x = 860 / 5 = 172
f ) 5y - 7 = 38 ==> 5y = 45 ==> y = 45 / 5 = 9
    9 +28 - 2y = 15 ==> 2y = 37 - 15 ==> y = 22 / 2 = 11
18 4 18
2014-10-22T17:56:16+03:00
A) 9x=2755-28 , 9x=2727 , x= 2727/9 , x= 303. (/ = supra.)
a)510+14x=762 , 14x=762-510 , 14x= 252 , x=252/14 , x= 18.
b)5y-97=943 , 5y=943+97 , 5y=1040 , y=1040/5 , y= 208.
b)410-7y=151 , -7y=151-410 , -7y=-259 , y=-259/-7 ,y=37.
c)3(x+7)=75 , 3x+21=75, 3x=75-21, 3x=54, x=54/3 , x=18.
(4(12-x)=70 , 168-14x=70 , -14x=70-168 , -14x=-98 , x=-98/-14 , x= 7
14 4 14