1. a) 3,2+2,3•6=13,8+3,2=17
3,2+13,8=17=17
17=17=17 Adevărat!
b) 8,75+x=10,5
x=10,5-8,75
x=1,75. Adevărat!
2. a) x, y-numerele
x+y/2=7,5
x=9,6
9,6+y=7,5•2
9,6+y=15
y=15-9,6
y=5,4.
b) 3,5hm=350m; 2,5dam=25m; 150dm=15m.
350-25+15=340m.
c) 2,5•[6,4+2•(9,75-7,25)-5•(0,4)]= 2,5•(6,4+2•2,5-2)= 2,5•(6,4+5-2)= 2,5•9,4= 23,5.