(140 - 80) : 4 * 5 = 75 8 * 30 - 30 : (3 * 5) = 240 - 30 : 15 = 238
(140 - 80 : 4) * 5 = 600 8 * (30 - 30) : 3 * 5 = 0
140 - 80 : (4 * 5) = 136 (8*30 - 30) : 3 * 5 = 210:3*5=70*5= 350
<span>240*710+7100*76 = 71 (2400+7600) = 71 * 10 000 = 710 000.
</span><span>
38*5800+380*520 = 38 (5800 + 5200) = 38* 11 000 = 38 * (10 000 + 1000) = 380 000 + 38 000 = 418 000.
</span>
4x=24+x
4x-x=24
3x=24
x=8
8x-8=20-6x
8x+6x=20+8
14x=28
x=2
9-4x=3x-40
-4x-3x=-40-9
-7x=-49
x=7
4.7-1.1x=0.5x-3.3
-1.1x-0.5x=-3.3-4.7
-1.6x=-8
x=5
5/6x+16=4/9x+9
21x=25
x=1.2
1500=2,2,5,5,5,3 все что смог