直接写得数．
10÷0.01=      0.22+0.8=     10﹣2.05=     3.5×0.4=         4÷0.25=
0÷19.8=       0.2×0.05=    0.6×1.5=     1.36+2.87+3.64=    1.8×0.4×0.25=