4.6＋2.4=       7.5－5=         0.6+0.2=        2.5×0.4=

9.2－1.2=       0.8×0.4=        4×0.2=          4.2+0.1=

0.72+8=        0.3×0.3=        0.12×0.4=       0.4×100=