Question

Verifică egalitățile: 2x5+7=3x4+9; 70-6x4=8x3+21; 25+6x3=9x3+16; 92 +5x7=10x10+3x9; 6x7+3x5-8x2=98-8x9+4x4; 61+9x9-8x7=9x6+8x8-5x4. Cine știe,e pentru fratele mai mic. ????

Answer 1

2x5+7=3x4+9
10+7=12+9
17=21 (fals)


70-6x4=8x3+21
70-24=24+21
46=45 (fals)


25+6x3=9x3+16
25+18=27+16
43=43 (adevărat)


92 +5x7=10x10+3x9
92 +35=100+27
127=127 (adevărat)


6x7+3x5-8x2=98-8x9+4x4
42+15-16=98-72+16
57-16=26+16
41=42 (fals)


61+9x9-8x7=9x6+8x8-5x4
61+81-56=54+64-20
142-56=118-20
86=98 (fals)