Ejercicios complementarios 1
1Calcula.
:③Calcula.
9+8=9+\overbrace{1}+\overbrace{7}=\overbrace{17}
14-9=14-\textcircled{4}-\textcircled{5}=\textcircled{5}
a)\mathbf{5}+\mathbf{9}=\mathbf{5}+\mathbf{\bigtriangleup}+\mathbf{\bigtriangleup}=\mathbf{\bigtriangleup}
a)11-2=11-\bigcirc-\bigcirc=\bigcirc
b)\;\mathbf{8}+\mathbf{3}=\mathbf{8}+\mathbf{\bigcirc}\mathbf{\bigcirc}\mathbf{\bigcirc}+\mathbf{\bigcirc}\mathbf{\bigcirc}=\mathbf{\bigcirc}\mathbf{\bigcirc}
16-9=16-\textcircled{1}-\textcircled{2}=\textcircled{3}
3+9=3+\left(\frac{3}{2}\right)+\left(\frac{3}{2}\right)=\left(\frac{3}{2}\right)
13-5=13-\bigcirc-\bigcirc=\bigcirc
9+6=9+\bigcirc\quad+\bigcirc\quad=\bigcirc
\mathrm{d})\mathrm{11}-\mathrm{7}=\mathrm{11}-\mathrm{\bigcirc}-\mathrm{\bigcirc}=\mathrm{\bigcirc}
e)4+7=4+\bigcirc+\bigcirc+\bigcirc=\bigcirc
e)14-7=14-\bigcirc-\bigcirc=\bigcirc
f)8+5=8+\bigcirc+\bigcirc=\bigcirc
f)14-9=14-\textcircled{1}-\textcircled{2}=\textcircled{3}
② Calcula.
a)9+2=9+\bigcirc+\bigcirc+\bigcirc=\bigcirc
a)15-6=15-\bigcirc-\bigcirc=\bigcirc
b)\mathbf{5}+\mathbf{8}=\mathbf{5}+\mathbf{\bigtriangleup}+\mathbf{\bigtriangleup}=\mathbf{\bigtriangleup}
b)17-9=17-\bigcirc-\bigcirc=\bigcirc
\mathbf{c})\mathbf{8}+\mathbf{9}=\mathbf{8}+\mathbf{\bigcirc}+\mathbf{\bigcirc}+\mathbf{\bigcirc}=\mathbf{\bigcirc}
13-6=13-\bigcirc-\bigcirc=\bigcirc
\boldsymbol{a})\boldsymbol{7}+\boldsymbol{b}=\boldsymbol{7}+\boldsymbol{\bigcirc}+\boldsymbol{\bigcirc}+\boldsymbol{\bigcirc}=\boldsymbol{\bigcirc}
\mathrm{d})\mathrm{11}-\mathrm{3}=\mathrm{11}-\mathrm{\bigcirc}-\mathrm{\bigcirc}=\mathrm{\bigcirc}
e)\vec{7}+4=\vec{7}+\bigcirc\quad+\quad\bigcirc\quad=\quad\bigcirc\quad
12-7=12-\bigcirc-\bigcirc=\bigcirc
\mathrm{f})4+9=4+\bigcirc\bigcirc\bigcirc\bigcirc\bigcirc=\bigcirc\bigcirc\bigcirc\bigcirc\bigcirc\mathrm{f})15-7=15-\bigcirc\bigcirc\bigcirc=\bigcirc 15-7=15-\bigcirc-\bigcirc=\bigcirc
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