2.7+1.5=1-0.36=125×8=880÷11=25×16=
202+99=4×7÷4×7=3-0.6+0.4=90.5÷100=100÷20×5=

解：2.7+1.5=4.2，1-0.36=0.64，125×8=1000，880÷11=80，25×16=400，
202+99=301，4×7÷4×7=49，3-0.6+0.4=2.8，90.5÷100=0.905，100÷20×5=25．

分析：25×16把16分解成4×4，再運(yùn)用乘法結(jié)合律簡(jiǎn)算；202+99運(yùn)用湊整法簡(jiǎn)算；4×7÷4×7，3-0.6+0.4，100÷20×5按照從左到右的順序計(jì)算；其它題目根據(jù)運(yùn)算法則直接求解．
點(diǎn)評(píng)：本題考查了基本的運(yùn)算，注意運(yùn)算順序和運(yùn)算法則，靈活運(yùn)用所學(xué)的運(yùn)算定律進(jìn)行簡(jiǎn)便計(jì)算．
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