a) -16-5-(-21)
=(-21)+21
=0.
b) -11+23-(-21)
=12+21
=33.
c) -13-15+5
=-28+5
=-23.
K mình nhé, giải rồi đó.
\(a,-16-5-\left(-21\right)\)
\(=-16+\left(-5+21\right)\)
\(=-16+16\)
\(=0\)
\(b,-11+23-\left(-21\right)\)
\(=\left(-11+21\right)+23\)
\(=10+23\)
\(=33\)
\(c,-13-15+5\)
\(=-13+\left(-15+5\right)\)
\(=-13-10\)
\(=-23\)
-16-5-(-21)=-21+21
=0
b) -11+23-(-21)=12+21
=33
c) -13-15+5=-28+5
=-23
a)-16-5-(-21)=-16+(-5)-(-21)=-(16-5)-(-21)=-11-(-21)=-11+21=+(21-11)=+10
b)-11+23-(-21)=+(23-11)-(-21)=+12-(-21)=12+21=33
c)-13-15+5=-13+(-15)+5=-(15-13)+5=-2+5=+(5-2)=+3
k cho mình nha
a)-16-5-(-21)=-16+(-5)+21
=-21+21
=0
b)-11+23-(-21)=12-(21)
=12+21
=33
c)-13-15+5=-13+(-15)+5
=-28+5
=-23