Răspuns:
Știm că:
suma=879
termenul 1=257
termenul 2=?
257+t=879
t=879-257
t=622
v:257+622=879
Calculăm:
a)2×4+18=
8+18=
26
b)6×7+25+25=
42+25+25=
67+25=
92
c)134+6×7=
134+42=
176
d)5×7:5+27=
35:5+27=
7+27=
34
e)3×3:3+3=
9:3+3=
3+3=
6
f)1×0+145=
0+145=
145
g)324+45:9×9+347-100=
324+5×9+347-100=
324+45+347-100=
369+347-100=
716-100=
616
h)789-145+14-46+456=
644+14-46+456=
658-46+456=
612+455=
1 068
i)876-657+(152+321)=
876-657+473=
219+473=
692