Explicație pas cu pas:
a) 7×8+6×7-3×7= 7×(8+6-3)=7×11=77
9+5×6-25÷5= 9+30-25÷5= 9+30-5= 34
b) 7×6-12+7×10= 42-12+7×10= 42-12+70= 100
15-15÷3+2×5×5= 15-5+2×5×5= 15-5+50=60
c) 400+5×8+72÷9-48= 400+40+72÷9-48= 400+40+8-48=400
300-64÷8+6×6-28= 300-8+6×6-28=300-8+36-28=300