Question

Afla numărul necunoscut din urmatoarele operatii:
a) 32:8+3×(60+8×(360:a-72:4)]=712
b) 3+10×[181×2-2×5×(24+24:a)]=623

Answer 1

a)
32:8+3×[60+8×(360:a-72:4)]=712
4+3×[60+8×(360:a-18)]=712
3×[60+8×(360:a-18)]=712-4
3×[60+8×(360:a-18)]=708
60+8×(360:a-18)=708:3
60+8×(360:a-18)=236
8×(360:a-18)=236-60
8×(360:a-18)=176
360:a-18=176:8
360:a-18=22
360:a=22+18
360:a=40
a=360:40
a=9


b)
3+10×[181×2-2×5×(24+24:a)]=623
10×[362-10×(24+24:a)]=623-3
10×[362-10×(24+24:a)]=620
362-10×(24+24:a)=620:10
362-10×(24+24:a)=62
10×(24+24:a)=362-62
10×(24+24:a)=300
24+24:a=300:10
24+24:a=30
24:a=30-24
24:a=6
a=24:6
a=4