8×4=12×3=
80×4=120×3=
8×40=12×30=
80×40=120×30=
800×40=1200×30=

解：8×4=3212×3=36
80×4=320120×3=360
8×40=32012×30=360
80×40=3200120×30=3600
800×40=320001200×30=36000

分析：根據(jù)因數(shù)與積的變化規(guī)律，一個(gè)因數(shù)不變，另一個(gè)因數(shù)擴(kuò)大（或縮�。⿴妆�，積也就擴(kuò)大（或縮小）相同的倍數(shù)．
點(diǎn)評(píng)：此題主要考查乘法算式中兩個(gè)因數(shù)的變化引起積的變化規(guī)律，要注意根據(jù)題意靈活解答．
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4.7+2.3=4.5×2=6.9-2.5=7.2×0.8=
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84÷0.21=0.75÷0.25=2.5×16=0.108÷2=
1.75+32.5=16-5.07=5.2÷13=1.64÷41=
1.02×0.2=0.26×0.3=8.4×0.02=1.29×6=
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