Ответ:
- \((x+0.8)\cdot0.8=4\Rightarrow x+0.8=5\Rightarrow x=4.2\).
- \((2.8-x)\cdot0.8=0.18\Rightarrow2.8-x=0.225\Rightarrow x=2.575\).
- \(1.32:(x-2.1)=0.6\Rightarrow x-2.1=2.2\Rightarrow x=4.3\).
- \(0.15:(3.56-x)=2.5\Rightarrow3.56-x=0.06\Rightarrow x=3.5\).
- \(6:(5.3+x)=0.1\Rightarrow5.3+x=60\Rightarrow x=54.7\).
- \(1.6x+2x=14\Rightarrow3.6x=14\Rightarrow x=\frac{35}{9}\).
- \(1.8x+2.5x=8.36\Rightarrow4.3x=8.36\Rightarrow x=1.944\ldots\).
- \(9x-6.9x=0.651\Rightarrow2.1x=0.651\Rightarrow x=0.31\).
- \(4x-3.99x=6\Rightarrow0.01x=6\Rightarrow x=600\).
- \(0.19x+0.35x=0.108\Rightarrow0.54x=0.108\Rightarrow x=0.2\).
- \(0.2x+0.3=10.7\Rightarrow0.2x=10.4\Rightarrow x=52\).
- \(0.01x-2.8=6.2\Rightarrow0.01x=9\Rightarrow x=900\).
- \(4.13+0.1x=4.25\Rightarrow0.1x=0.12\Rightarrow x=1.2\).
- \(12:0.5x=4.8\Rightarrow0.5x=2.5\Rightarrow x=5\).
- \(0.44:x\cdot1.1=1.21\Rightarrow\frac{0.484}{x}=1.21\Rightarrow x=0.4\).
Ответы: 1) 4,2; 2) 2,575; 3) 4,3; 4) 3,5; 5) 54,7; 6) \(35/9\); 7) 1,944…; 8) 0,31; 9) 600; 10) 0,2; 11) 52; 12) 900; 13) 1,2; 14) 5; 15) 0,4.
