Упростите выражение и найдите его значение 1)0.8x*4-0.7y*(-5) x=5 y=-2 2)-1.4m*6+2.9n* m=0.5 n=-3
3)1/6x*(-4)+15y*1/3 x=6 y=0,2
4)5/8m*2/5-5/7n*3,5 m=-8 n=2
ДАЮ 20 БАЛЛОВ
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