А) 49+(98:14)=49+7=56
б) (105:7)-(3×5)=15-15=0
Б)49.2÷12.3×100%=400%
а)12.3÷49.2×100%=25%
в)40÷0.04×100%=100000%.
Y*4.9=2.94
y=2.94 : 4.9
y=0.6
0.6*4.9=2.94
2.94=2.94
y*0.7=0.0091
y=0.0091:0.7
y=0.013
0.013*0.7=0.0091
0.0091=0.0091
y:2,3=5,6
y=2.3*5.6
y=12.88
12.88 : 2.3=5.6
5.6=5.6