Oblicz : a) 1 1/5 - 0,42 * 2/7 = b) 2 1/4 : 2 4/7 + 6,5 = c)0.28*4,5=d)12,42:0,04=
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a) 1 1/5 - 0,42 * 2/7 =6/5-0,42*2/7=1,2-0,42*2/7=1,2-0,12=1,08
b) 2 1/4 : 2 4/7 + 6,5 =9/4:2i4/7+6,5=9/4:18/7+6,5=2,25:18/7+6,5=0,875+6,5=7,375
c)0.28*4,5=1,26
d)12,42:0,04=310,5