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106097
@106097
December 2021
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помогите!!!№3 4 5 плиз!!!!
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Uranium235
Ответ на №3
0,4(0,9-5/7*х)-0,9(0,4-10/7*х)=
0,4*0,9-20/70*х-0,9*0,4+90/70х=
110/70х=
11/7х
Ответ на №4:
3(5*(-0.2)-4*0.7)-4(3*-0.2)-2*0.7)=
3*(-3.8)-4*(-2)=
-11,4+8=-3.4
2 votes
Thanks 1
lubimaiamama67
5.
0.6z-2/9z=-3.4
6/10z-2/9z=-34/10 |*90
54z-20z=-306
34z=-306
z=-306:34
z=-9
1 votes
Thanks 1
106097
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Answers & Comments
0,4(0,9-5/7*х)-0,9(0,4-10/7*х)=
0,4*0,9-20/70*х-0,9*0,4+90/70х=
110/70х=
11/7х
Ответ на №4:
3(5*(-0.2)-4*0.7)-4(3*-0.2)-2*0.7)=
3*(-3.8)-4*(-2)=
-11,4+8=-3.4
0.6z-2/9z=-3.4
6/10z-2/9z=-34/10 |*90
54z-20z=-306
34z=-306
z=-306:34
z=-9