16х-16-9х+9-2х+2=5
5х-5=5
5х=5+5
5х=10
х=10÷5
х=2
4(4×2-4)-3(3×2-3)-2(2-1)=5
4×4-3×3-2×1=5
16-9-2=5
5=5
<span>(x-70) - 450 = 120
x-70=120+450
x-70=570
x=570+70
x=640
-----------------или так-----------
</span><span>(x-70) - 450 = 120
x-70-450=120
x-520=120
x=120+520
x=640
-----------------------или-------
</span>(x-70) - 450 = 120
x-70-450=120
x=120+70+450
x=640
1) (8-х)*|-0.72|=0
(8-х)*0.72=0
-0.72х=-5.76
-0.72х:(-0.72)=-5.76:(-0.72)
х=8
2) (х-234)*(-234)=0
-х*234-234*(-234)=0
-234х+54756=0
-234х=-54756
-234х:(-234)=-54756:(-234)
х=234
6мин = 6/60 = 6*1/6*10 = 1/10 = 0.1
12мин= 12/60 = 6*2/6*10 = 2/10 = 0.2
15мин=15/60=3*5/3*20=5/20=1/4=0.25
30мин=30/60=1/2=0.5
45мин=45/60=15*3/15*4=3/4=0.75
1ч6мин=1+1/10=1.1
7ч15мин=7+1/4=7.25
2ч18мин=2+6*3/6*10=2+3/10=2.3
4ч45мин=4+3/4=4.75