Используя свойства вычитания, вычислите рациональным способом:
1) 12,918-(4,918+3,4)
2) (6,403+8,715)-2,403
3) (13,245+9,88))-6,88
4) 11,703-(5,4+2,703).
1) 12,918-(4,918+3,4)
2) (6,403+8,715)-2,403
3) (13,245+9,88))-6,88
4) 11,703-(5,4+2,703).
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12,918-(4,918+3,4=12,918-4,918 - 3,4=8-3,4=4,6(6,403+8,715)-2,403=6,403-2,403+8,715=4+8,715=12,715
(13,245+9,88)-6,88=13,245+9,88-6,88=13,245+3=16,245
11,703-(5,4+2,703)=11,703-2,703-5,4=9-5,4=3,6