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b) 4*2+0,4*1-7,2*5 = -27,6
c) 4*1+0,4*(-1)-7,2*(-1)= 10,8
d) 4*10+0,4*10-7,2*10 = -28
e) 4*1/4+0,4*3/4-7,2*1/6 = 0,3
f) 4*(-1)+0,4*1-7,2*1 = -10,8
b) 3,4*2+0.4*1-7.2*5=6.8+0.4-36=-28,8
c)3,4-0.4+7,2=10,2
d)3.4*10+0.4*10-7.2*10=34+4-72=-34
e) 3.4*1/4+0.4*3/4-7.2*1/6=0.85+0.3-1,2=-0.05
f) -3,4+0.4-7.2=-10.2