分析:①96+320÷16-38根據(jù)四則混合運(yùn)算的順,先算320÷16,再算96加320÷16的商,最后算減;
②730-(450+300)÷25,先算450+300的和,再算和除以25,最后算730減它們的差;
③(334-209)×8÷25,先算小括號(hào)里的334-209的差,再算乘和除;
④213×42+213×58,利用乘法的分配律變成213×(42+58)計(jì)算簡(jiǎn)便;
⑤2.04-0.36-1.64利用一個(gè)數(shù)連續(xù)減去兩個(gè)數(shù)等于這個(gè)數(shù)減去這兩個(gè)數(shù)的和,變成2.04-(0.36+1.64);
⑥8.29+3.7+0.71+6.3利用加法的交換律和結(jié)合律變成(6.29+0.71)+(3.7+6.3)計(jì)算簡(jiǎn)便.
解答:解;①96+320÷16-38,
=96+20-38,
=78;
②730-(450+300)÷25,
=730-750÷25,
=730-30,
=700;
③(334-209)×8÷25,
=125×8÷25,
=1000÷25,
=40;
④213×42+213×58,
=213×(42+58),
=213×100,
=21300;
⑤2.04-0.36-1.64,
=2.04-(0.36+1.64),
=2.04-2,
=0.04;
⑥8.29+3.7+0.71+6.3,
=(8.29+0.71)+(3.7+6.3),
=9+10,
=19.
點(diǎn)評(píng):考察了運(yùn)算定律和簡(jiǎn)便計(jì)算,四則混合運(yùn)算,注意運(yùn)算順序和運(yùn)算法則,靈活運(yùn)用運(yùn)算定律進(jìn)行簡(jiǎn)便計(jì)算.