1.5×1052.33×0.5×424.6+18.7+15.4
1.2×2.5+0.8×2.52.05÷0.82+33.69.07-22.78÷3.4.

解:(1)1.5×105        
=1.5×(100+5)
=1.5×100+1.5×5
=157.5;
(2)2.33×0.5×4  
=2.33×(0.5×4)
=2.33×2
=4.66;
(3)24.6+18.7+15.4
=24.6+15.4+18.7
=40+18.7
=58.7;
(4)1.2×2.5+0.8×2.5  
=2.5×(1.2+0.8)
=2.5×2
=5;
(5)2.05÷0.82+33.6 
=2.5+33.6
=36.1;
(6)9.07-22.78÷3.4
=9.07-6.7
=2.37;
故答案為157.5;4.66;58.7;5;36.1;2.37.
分析:(1)可運(yùn)用乘法分配律進(jìn)行計(jì)算;
(2)可運(yùn)用乘法結(jié)合律進(jìn)行計(jì)算;
(3)可運(yùn)用加法交換律進(jìn)行計(jì)算;
(4)可運(yùn)用乘法分配律進(jìn)行計(jì)算;
(5)先算除法,再算加法;
(6)先算除法,再算減法.
點(diǎn)評:此題是考查小數(shù)四則混合運(yùn)算的能力,要看清題中的數(shù)字及運(yùn)算符號,靈活的選擇合適的方法進(jìn)行計(jì)算.
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