<span>1)150-x:2=140
х:2=150-140
х:2=10
х=10*2
х=20
</span><span>2)(150-x):2=65
</span>150-х=65*2
150-х=130
х=150-130
х=20
<span>3)(300-18)•x=1410
282*х=1410
х=1410:282
х=5
</span><span>4)5•x-600=900
5х=900+600
5х=1500
х=1500:5
х=300</span>
8/25 м^2 = 100*8/25 дм^2 = 32
360<span>*0,05=18 -5\%
</span><span>260*0,15=54 - 15\%
360*0,25=90- 25\%
360*0,45=162- 45\%
</span>