<span><em>(4a-7b)+(2a-b)+(5a-6b)</em>
<em>4a-7b+2a-b+5a-6b</em>
<em>11a-14b</em>
Ответ:11a-14b</span>
1)420*5=2100 2)420+80=500 3)500*5=2500 4)2500-2100=400
(5,12+x)*0,14=8,4 2,472:(30-y)=0,12 (x-4,7)*3,4=12,92 12,7-4,5x=8,29Помогите пажадуйсто
lopatino [1.5K]
<span>(5,12+x)*0,14=8,4
0,7168 + 0,14x = 8.4
0.14x = 7.6832
x = 54. 88
</span><span>(x-4,7)*3,4=12,92
</span>x - 4.7 = 12,92 : 3.4
x - 4.7 = 3.8
x = 8.5
<span>12,7-4,5x=8,29
</span>4,5x = 12.7 - 8.29
4.5x = 4.41
x = 0.98
2,472:(30-y)=0,12
30 - y = 2.472 : 0,12
30 - y = 20.6
y = 9.4