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Sagot :
Sure! Let's evaluate the expression [tex]\( ab - 0.5b \)[/tex] step by step, given that [tex]\( a = 1 \)[/tex] and [tex]\( b = 5 \)[/tex].
1. Start by substituting the values of [tex]\( a \)[/tex] and [tex]\( b \)[/tex] into the expression:
[tex]\[ ab - 0.5b = 1 \cdot 5 - 0.5 \cdot 5 \][/tex]
2. First, multiply [tex]\( a \)[/tex] and [tex]\( b \)[/tex]:
[tex]\[ 1 \cdot 5 = 5 \][/tex]
3. Next, multiply 0.5 and [tex]\( b \)[/tex]:
[tex]\[ 0.5 \cdot 5 = 2.5 \][/tex]
4. Then, subtract the result of [tex]\( 0.5b \)[/tex] from the result of [tex]\( ab \)[/tex]:
[tex]\[ 5 - 2.5 = 2.5 \][/tex]
So, the evaluated result of the expression [tex]\( ab - 0.5b \)[/tex] when [tex]\( a = 1 \)[/tex] and [tex]\( b = 5 \)[/tex] is:
[tex]\[ \boxed{2.5} \][/tex]
1. Start by substituting the values of [tex]\( a \)[/tex] and [tex]\( b \)[/tex] into the expression:
[tex]\[ ab - 0.5b = 1 \cdot 5 - 0.5 \cdot 5 \][/tex]
2. First, multiply [tex]\( a \)[/tex] and [tex]\( b \)[/tex]:
[tex]\[ 1 \cdot 5 = 5 \][/tex]
3. Next, multiply 0.5 and [tex]\( b \)[/tex]:
[tex]\[ 0.5 \cdot 5 = 2.5 \][/tex]
4. Then, subtract the result of [tex]\( 0.5b \)[/tex] from the result of [tex]\( ab \)[/tex]:
[tex]\[ 5 - 2.5 = 2.5 \][/tex]
So, the evaluated result of the expression [tex]\( ab - 0.5b \)[/tex] when [tex]\( a = 1 \)[/tex] and [tex]\( b = 5 \)[/tex] is:
[tex]\[ \boxed{2.5} \][/tex]
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