Выполните действия: 1) 7,8:0,9+2,6×0,9+2,6×0,5;2) (5,29+123,4×0;05):1,91; 3) (72,3-45,78:3)×0,25; 4) (9,68:1,76×0,7-2,05):0,6.
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