Решите, применяя законы арифметических действий
1) 1/4×(2,4-3,2+4,8-3,6)
2) 1/3×(7,8-12,3-1,8+0,3)
3) (4,9+9,17-14,35)×1/7
4) (0,81+1,89-137,7)×1/9
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