Находим общий знаменатель. Он будет 420.
66/420 + 147/420 + 182/420 = 389/420
А. 20-4у-30= 4у+10
б. -72 -8х +50= 8х+22
в. 12а+24-10= 12а+14
г. -38+19х+20= 19х-18
д. 112 - 16а - 90= 16а-22
е. -15х - 60 +60=-15х
<span>1)(0,9x+4,55)*0,3=1,5;
0.9*0.3+4.55*0.3=1.5
0.27+4.55*0.3=1.5
0.27х+1.365=1.5
0.27х=1.5-1365
0.27х=0.135
х=0.135</span>÷0.27
х=0.5
2)<span>60,8:(5,3x-2,15)=5;
60.8*5.3х-60.8*2.15=5
322.24х-60.8*2.15=5
322.24х-130.72=5
322.24х=5+130.72
322.24х=135.72
х=135.72</span>÷322.24
х=0.421177
<span>3)(0,75x+6,8)*0,1=0,98;
</span>0.75х*0.1+6.8*0.1=0.98
0.075х+0.68=0.98
0.075х=0.98-0.68
0.075=0.3
х=0.3÷0.075
х=4