Răspuns :
64:8:4x6+6x4:8x7+56:8=40
8:4x6+6x4:8x7+56:8=40
2x6+6x4:8x7+56:8=40
12+24:8x7+7=40
12+3x7+7=40
12+21+7=40 adevarat
8:4x6+6x4:8x7+56:8=40
2x6+6x4:8x7+56:8=40
12+24:8x7+7=40
12+3x7+7=40
12+21+7=40 adevarat
64:8:4•6+6•4:8•7+56:8
8:4•6+24:8•7+7
2•6+3•7+7
12+21+7
33+7
40
40=40(corect)