理由:( )。
5.3÷0.1= 0.4×2.5= 6.2×3+1.5= 1.4×3÷1.4×3=
0.52= 5a×2a= 4.8x+0.8x= 12.1x÷11=
16÷x=2.5
8.4x+3x=228
1.5x-4×2.1=2.1
5(x-4.5)=40
163×1.8163 163×0.18163
2.7×12.7× (0.8+0.2) 7.3×6.464×0.73
9.4-3.2= 2×10%= + = 0.32= 3.14×8=
÷2= 8:13= 1- = × = 870÷29=