1) 12,3(х+1,4)=36,9
х+1,4=36,9÷12,3
х+1,4=3
х=3-1,4
х=1,6
2) 72÷(х-10)-5= х=22
=72÷(22-10)-5=
=72÷12-5=6-5=1
3)1,5а-0,4у а=2,6; у=5,07
1,5×2,6-0,4×5,07=
=3,9-2,028=1,872
1) 12,3(х+1,4)=36,9
х+1,4=36,9÷12,3
х+1,4=3
х=3-1,4
х=1,6
2) 72÷(х-10)-5= х=22
=72÷(22-10)-5=
=72÷12-5=6-5=1
3)1,5а-0,4у а=2,6; у=5,07
1,5×2,6-0,4×5,07=
=3,9-2,028=1,872