7.8*0.25+2.2/4
=7.8*(1/4)+2.2/4
=7.8/4+2.2/4
=(7.8+2.2)/4
=10/4=2.5
解：7.8×0.25＋2.2÷4
＝7.8×0.25＋2.2×0.25
＝﹙7.8＋2.2﹚×0.25
＝10×0.25
＝2.5
=7.8/4+2.2/4=10/4=2.5
（7.8*0.25+2.2/4）*4/4
=（7.8*1+2.2*1）/4
=10/4=2.5
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