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1) -10 / 20+1/9-(-10/5)+2=
-(10 / 20) = -0,5
1 / 9 = 0,11
-(10 / 5) = -2
-0.5-(-2)+2
(-0.5) + 0.11 - (-2) + 2 = 3.61
2) -10/20+1/9+10/5+2
-(10 / 20) = -0,5
1 / 9 = 0,11
10 / 5 = 2
(-0.5) - 0.11 + 2 + 2 = 3.39
3) 3/5-10/10+(-10)=0
3 / 5 = 0,6
10 / 10 = 1
0.6 - 1 + (-10) = -10.4
4) 2/3 ÷ 3/5 +2/5=
2 / 3 = 0,66
3 / 5 = 0,6
2 / 5 = 0,4
0,66/0,6+0,4
0,66 / 1 = 0,66