2.1×3.9= 0.21×=0.819
加法算式:
乘法算式:
478 2306 4967 708 6789 5046
<<<<<
+ = 1- = 1.25× = - =
0.9+99×0.9= 0÷ = 1÷ = -0.5=
0.6×101= 3.2×2.5×12.5=