Question

4. Реши уравнения.
35 + 23 + х = 100
70 – a = 8 +9+2
а+ (45 – 30) = 75
x — (23 + 17) = 60
(30 – 15) +y= 80
х+ 12 = 50 – (15+5)​

Answer 1

$displaystyle tt 35+23+x=100\displaystyle tt 58+x=100\displaystyle tt x=100-58\displaystyle tt bold{x=42}$

$displaystyle tt 70-a=8+9+2\displaystyle tt 70-a=19\displaystyle tt -a=19-70\displaystyle tt -a=-51\displaystyle tt bold{a=51}$

$displaystyle tt a+(45-30)=75\displaystyle tt a+15=75\displaystyle tt a=75-15\displaystyle tt bold{a=60}$

$displaystyle tt x-(23+17)=60\displaystyle tt x-40=60\displaystyle tt x=60+40\displaystyle tt bold{x=100}$

$displaystyle tt (30-15)+y=80\displaystyle tt 15+y=80\displaystyle tt y=80-15\displaystyle tt bold{y=65}$

$displaystyle tt x+12=50-(15+5)\displaystyle tt x+12=50-20\displaystyle tt x+12=30\displaystyle tt x=30-12\displaystyle tt bold{x=18}$