直接写得数．1-0.25=3.4+1.6=4.3-0.8=2.7+8.4=0.07×3=0.8×1.25=1.2×0.4=0.5×0.9=

网友回答

解：1-0.25=0.75；3.4+1.6=5；4.3-0.8=3.5；2.7+8.4=11.1；0.07×3=0.21；0.8×1.25=1；1.2×0.4=0.48；0.5×0.9=0.45．故