7.7×7+7.7+2×7.7=7.7×(7+1+2)=7.7×10=77125÷(50÷8)=125÷50×8=125×8÷50=1000÷50=20
7.7*(7+2+1)=7.7*10=77 125除以50乘以8=125乘以8除以50=1000除以50=20
7.7×(7+1+2)=7.7×10=77
(7+2+1)×7
7.7*(7+1+2)=77;