Вычислить, выбирая удобный порядок вычислений: 1) -26+64-47-18+26=
2) 11.8-3.44-9.56+4.2=
3) -2*3.7*(-2.5)*(-4)=
4) -4/5 *17+8* (-4/5)=
(/-это дробь)
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