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b) 3,5 * + * 0,84 = 3,5 * 0,2 + * = 0,7 + = 0,7 + 0,24 = 0,94
c) (4 - 2) : 1 = : = * = = 1
d) 6,4 : 2 - 24,8: = : - 24,8 : 0,8 = * -31 = - 31 = 3 - 31 = (-28)
e) 24,75 : + 5 : 2 = 24,75 : 0,75 + 5,5 : 2,75 = 33 + 2 = 35
f) 70:(8-7,8-0,05)=70:(8,2-7,8-0,05)=70:(0,4-0,05)=70:0,35=200