Gaseste numerelele misterioase si scrieti cum se afla aceste numere: _______ Adaug 10---->scad 20----->scad 100---->adaug 4----->1657 _______ Scad 10------>inmultesc cu 2---->adaug 320---->inmultesc cu 2---->800 ajutati-ma va rog frumos!!

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Răspunsuri

2014-05-27T15:42:36+03:00
Eu voi face prin ecuatie
1) x+10-20-100+4=1657
x+10-20-100=1657-4
x+10-20-100=1653
x+10-20=1653+100
x+10-20=1753
x+10=1753+20
x+10=1773
x=1773-10
x=1763

2) x-10×2+320×2=800
x-10×2+320=800:2
x-10×2+320=400
x-10×2=400-320
x-10×2=80
x-10=80:2
x-10=40
x=40-10
x=30
1 5 1
2014-05-27T15:51:24+03:00
A)x+10-20-100+4=1657<=>x+10-20-100=1657-4<=>x+10-20-100=1653<=>x+10-20=1653+100<=>x+10-20=1753
<=>x+10=1753+20<=>x+10=1773<=>x=1773-10<=>x=1763
b) x-10×2+320×2=800<=>x-10×2+320=800:2<=>x-10×2+320=400<=>x-10×2=400-320<=>x-10×2=80<=>x-10=80:2<=>x-10=40<=>x=40-10<=>x=30