Răspunsuri

2014-10-27T19:10:12+02:00
• 81-21-15+45=90.

•18+3(24-20)+4(32-30)
=18+12+8
=38.
2014-10-27T19:10:24+02:00
81-3x7-5x3+9x5= 81-21-15+45=60-15+45=45+45=90



18+3x(6x4-5x4)+4(8x4-6x5)=
18+3x(24-20)+4x(32-30)=18+3x4+4x2=18+12+8=30+2=32