Question

рещи уравнения. x+18=60+27; x-23= 31-19; (40+60)-x=19; x+(20+71)=100

Answer 1

х+18=60+27
х=60+27-18
х=69;
х-23=31-19
х=31-19+23
х=35;
(40+60)-х=19
100-х=19
х=81;
х+(20+71)=100
х+91=100
х=9.