решить уравнения:
1) 5×(-3х+1)-4×(2,5-2х)=0
2) -(4х-7)-3×(8-4х)=2х+5
3) -1/2×(6х-4)+3/7×(7х-14)=-4х+1
1) 5×(-3х+1)-4×(2,5-2х)=0
2) -(4х-7)-3×(8-4х)=2х+5
3) -1/2×(6х-4)+3/7×(7х-14)=-4х+1
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Answers & Comments
Пошаговое объяснение:
1) 5(-3х+1)-4(2,5-2х)=0
-15х+5-10+8х=0
-7х-5=0
-7х=5
Х= - 5/7
2) - (4х-7)-3(8-4х)=2х+5
-4х+7-24+12х=2х+5
-4х+12х-2х=5-7+24
6х=22
Х=22/6=11/3
3) - 1/2(6х-4)+3/7(7х-14)= - 4х+1
-3х+2+3х-6= - 4х+1
4х=1-2+6
4х=5
Х=5/4
Х=1,25