Question

Repede.Ex.7.Dau coroana

Answer 1

1)
a×6:9=72
a×6=72×9
a×6=648
a=648:6
a=108


300-(2×a+57)=131
2×a+57=300-131
2×a+57=169
2×a=169-57
2×a=112
a=112:2
a=56


a:8:5=5
a:8=5×5
a:8=25
a=25×8
a=200


(a×4+51)-203=20
a×4+51=20+203
a×4+51=223
a×4=223-51
a×4=172
a=172:4
a=43


a:2+43-(200-56):6=35
a:2+43-144:6=35
a:2+43-24=35
a:2+43=35+24
a:2+43=59
a:2=59-43
a:2=16
a=16×2
a=32


2)
10×21=210 (fire flori de camp)
7×19=133 (fire garofite)

210+133+12=355 (fire de flori in total)


3)

3+2=5 (rânduri meri si pruni)
130:5=26 (meri si pruni )
26:2=13 (pomi pe 1 rand )