考點(diǎn):小數(shù)四則混合運(yùn)算,運(yùn)算定律與簡(jiǎn)便運(yùn)算
專題:運(yùn)算順序及法則,運(yùn)算定律及簡(jiǎn)算
分析:(1)運(yùn)用減法的結(jié)合律進(jìn)行簡(jiǎn)算;
(2)運(yùn)用減法的性質(zhì)進(jìn)行簡(jiǎn)算;
(3)運(yùn)用加法的交換律先算加法,再算減法;
(4)先減去32.27,再減去26.4;
(5)運(yùn)用除法的性質(zhì)進(jìn)行簡(jiǎn)算;
(6)運(yùn)用乘法的分配律進(jìn)行簡(jiǎn)算.
解答:
解:(1)32.6+58.04+61.96
=32.6+(58.04+61.96)
=32.6+120
=152.6;
(2)98.2-37.18-10.82
=98.2-(37.18+10.82)
=98.2-48
=50.2;
(3)56.23-54.1+31.07
=56.23+31.07-54.1
=87.3-54.1
=33.2;
(4)98.27-26.4-32.27
=98.27-32.27-26.4
=66-26.4
=39.6;
(5)1300÷25÷4
=1300÷(25×4)
=1300÷100
=13;
(6)99×67
=(100-1)×67
=100×67-1×67
=6700-67
=6633.
點(diǎn)評(píng):考查了運(yùn)算定律與簡(jiǎn)便運(yùn)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)用所學(xué)的運(yùn)算定律簡(jiǎn)便計(jì)算.