Вычислите удобным способом:

1) -2.6+(-0.3)+(-1.4)+(-9.7)   2) 1.5-5.4+(-1.6)+8.5   3) 4.37+(-3.65)+(-7.35)+6.63

4) 0.13+(-9.94)+(-2.13)+(-0.06) решите пожалуста и спосибо
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