\(13\cdot75+25\cdot13-120\)
\(=975+325-120\)
\(=1300-120\)
\(=1180\)
\(190\cdot64+190\cdot36\)
\(=190\left(64+36\right)\)
\(=190\cdot100\)
\(=19000\)
a,13.(75+25)+120=13.100+120=1300+120=1420
b, 190.(64+36)=190.100=19000
c,465+58-465-38=58-38=20
tích nha
\(465+58+\left(-465\right)+\left(-38\right)\)
\(=0+58+\left(-38\right)\)
\(=20\)
\(a,13.75+25.13-120\)
\(=13.\left(75+25\right)-120\)
\(=13.100-120\)
\(=1300-120=1180\)
\(b,190.64+190.36\)
\(=190.\left(64+36\right)\)
\(190.100=19000\)
\(c,465+\left[58+\left(-465\right)+\left(-38\right)\right]\)
\(=465+\left(-465\right)+58+\left(-38\right)\)
\(=0+20=20\)
a.13.75+25.13-120=13.(75+25)-120
=13.100-120
=1300-120
=1180
b.190.64+190.36=190.(64+36)
=190.100
=19000
465+[58+(-465)+(-38)]=465+58+(-465)+(-38)
=[465+(-465)]+(20+38)+(-38)
=0+20+38+(-38)
=20+[38+(-38)]
=20+0
=20