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20. Calculap: a) 78-(-8+12-22)+5.(-4)"; c) -15-12-(-35-45) -40)-10': b) 10-(-2)-2-(16-20-30). d) 8 (-5)-20- [16+(-20)] +100 urgent​

20 Calculap A 788122254 C 15123545 4010 B 1022162030 D 8 520 1620 100 Urgent class=

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Crististelistu70ask

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a)78-(4-22)+5×16=78-(-18)+90=96+90=186

b)10×(-8)-2×(-4-30)=-80-2×-26=-80+52=-28

c)-15-(2×(-80)-40)-1000=-15-(-160-40)-1000=-15-(-200)-1000=15+200-1000=215-1000=-815

d)64×25-20×(16-20)+100=1600-20×(-4)+100=1600+120-100=1620

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