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jak coś będzie nie jasno to pisz !!
3,8+3+ 21/8 × (-10/7) -12/1 :(-10/3)=-3,8+3-15/4- 4/1 :(-10/1)=
= -0,8 -15/4+4/1 × 1/10= -0,8 -15/4+4/10= -0,8 -150/40 +16/40=
=-0,8-134/40=-8/10-134/40=-32/40-134/40= -166/40=-4 6/40=
= -4 3/20