數(shù)學(xué)公式                        
數(shù)學(xué)公式
6.5+3.5÷0.5×5.2                           
8400+108×42
數(shù)學(xué)公式
數(shù)學(xué)公式

解:(1)4×+45×,
=6+25,
=31;

(2),
=(1+)÷(145+),
=1÷145,
=;

(3)6.5+3.5÷0.5×5.2,
=6.5+7×5.2,
=6.5+36.4,
=42.9;

(4)8400+108×42,
=8400+4536,
=12936;

(5),
=[2+2.4×]÷1.1,
=[2.6+0.4]÷1.1,
=3÷1.1,
=;

(6),
=(12+1000+100-2)÷[56×-56×],
=[1000+100+(12-2)]÷[24-21],
=(1000+100+10)÷3,
=1110÷3,
=370.
分析:(1)同時(shí)兩個(gè)運(yùn)算乘法,再算加法;
(2)先算第一個(gè)小括號(hào)里面的乘法,再同時(shí)運(yùn)算第一個(gè)小括號(hào)里面的加法和第二個(gè)小括號(hào)里面的加法,最后算括號(hào)外的除法;
(3)先算除法,再算乘法,最后算加法;
(4)先算乘法,再算加法;
(5)先算小括號(hào)里面的減法,再算中括號(hào)里面的乘法,然后算中括號(hào)里面的加法,最后算括號(hào)外的除法;
(6)第一個(gè)小括號(hào)里面運(yùn)用湊整法簡(jiǎn)算,中括號(hào)里面運(yùn)用乘法分配律簡(jiǎn)算,最后算除法.
點(diǎn)評(píng):本題考查了四則混合運(yùn)算,注意運(yùn)算順序和運(yùn)算法則,靈活運(yùn)用所學(xué)的運(yùn)算定律進(jìn)行簡(jiǎn)便計(jì)算.
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