利用运算定律将式子变形。/n2h;@0P
a-2.3-0.77=5`5_'e,j=*B3M9O:\;s7~,^,A2`;z2g8g/T;C/n2h;@0P
a÷0.5=(a×.q2k3?-N2I:I7O5Y÷(0.5×2)=-O4i4},v0o+A5?.b/n2h;@0P
1.2(x+0.4)=3Q3k6?*Y6i+Q=0o3m3n2y.R/V*O8^:n/n2h;@0P