直接写出得数．
（79十21）÷20=0.093×100=0.7-0.47=0.16十3.7=900-178-122=4l×40=0.49+0.25=2-0.04=3.4十4.6-2.9=72÷6×（51+19）=
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解：
（79十21）÷20=50.093×100=9.30.7-0.47=0.370.16十3.7=3.86900-178-122=6004l×40=16400.49+0.25=0.742-0.04=1.963.4十4.6-2.9=5.172÷6×（51+19）=840
故