2 - Operações com decimais: ( utilize a regra dos sinais da adição e subtração): .
a) -8,7 +9,2 -12,3 +0,48.
b) +5,02 +0,3 -4,03 -5,0.
c) +18,1 -,09 +0,15 -1,3.
d) -15,3 -1,27 +3,01 +40,2.
e) -1,28 +20,5 -70,2 +40,08.
f) +82,3 - 1,92 +63, -70,2.
g) -1,05 +2,35 +43,2 -10,2.
h) -10,4 -10,6 -1,0 +,80 +,20. (ultimo favorzinho da manha eu juro ;-;)
Soluções para a tarefa
Olá!!!!!
a) -8,7 +9,2 -12,3 +0,48.
=−87/10+(46⋅25⋅2)−(12310)+(12⋅425⋅4)=
=−87/10+(46/5)−(123/10)+(12/25)=
=(−8/7)+(46⋅2)2⋅5−(123/10)+(12/25)=
=12−(123/10)+(12/25)=
=5−12/32⋅5+(12/25)=
=−595+(12/25)=
=(−59⋅5)+125⋅5=
=−283/25
b) +5,02 +0,3 -4,03 -5,0.
+(251⋅250⋅2)+(3/10)−(403/100)−(5⋅1010)=
=+(251/50)+(310)−(403/100)−(5)=
=+251+(3⋅5)5⋅10−(403/100)−(5)=
=+133/25−(403/100)−(5)=
=+(133⋅4)−403/25⋅4−(5)=
=+129/100−(5)=
=129−(5⋅100)100=
=371/100
c) +18,1 -,09 +0,15 -1,3
=+(181/10)−(9/10)+(3⋅520⋅5)−(13/10)=
=+181−910+(320)−(13/10)=
=+86/5+(3/20)−(13/10)=
=+(86⋅4)+35⋅4−(13/10)=
=+347/20−(13/10)=
=347−(13⋅2)2⋅10=
=321/20
d) -15,3 -1,27 +3,01 +40,2.
(−153⋅10)−12710⋅10+(301100)+(201⋅25⋅2)=
=−1657100+(301100)+(2015)=
=(−1657)+301100+(2015)=
=−33925+(2015)=
=(−339)+(201⋅5)5⋅5=
=666/25
e) -1,28 +20,5 -70,2 +40,08.
=−(32⋅425⋅4)+(41⋅52⋅5)−(351⋅25⋅2)+(1002⋅425⋅4)=
=−3225+(412)−(3515)+(100225)=
=(−32⋅2)+(41⋅25)25⋅2−(3515)+(100225)=
=96150−(3515)+(100225)=
=961−(351⋅10)10⋅5+(100225)=
=−254950+(100225)=
=(−2549)+(1002⋅2)2⋅25=
=−109/10
f) +82,3 - 1,92 +63, -70,2.
g) -1,05 +2,35 +43,2 -10,2.
=−(21⋅520⋅5)+(47⋅520⋅5)+(216⋅25⋅2)−(51⋅25⋅2)=
=−2120+(4720)+(2165)−(515)=
=(−21)+4720+(2165)−(515)=
=1310+(2165)−(515)=
=13+(216⋅2)2⋅5−(515)=
=892−(515)=
=(89⋅5)−(51⋅2)2⋅5=
=343/10
h) -10,4 -10,6 -1,0 +,80 +,20.
=−(52⋅25⋅2)−(53⋅25⋅2)−(1010)+80+20=
=−525−(535)−(1)+80+20=
=(−52)−535−(1)+80+20=
=−21−(1)+80+20=
=−22+80+20=
=58+20=
=78
ESPERO TER TE AJUDADO!!!!!
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