考點(diǎn):小數(shù)四則混合運(yùn)算
專題:運(yùn)算順序及法則
分析:(1)利用乘法分配律的逆運(yùn)算計(jì)算;
(2)先把0.32分解成4×0.8,然后利用乘法的結(jié)合律進(jìn)行計(jì)算;
(3)利用除法性質(zhì)進(jìn)行計(jì)算;
(4)利用乘法分配律進(jìn)行計(jì)算;
(5)先算小括號(hào)內(nèi)的,再算除法,最后算乘法;
(6)先算小括號(hào)內(nèi)的,再算中括號(hào)內(nèi)的,最后算括號(hào)外的.
解答:
解:(1)2.37×6.3+2.37×3.7
=2.37×(6.3+3.7)
=2.37×10
=23.7
(2)2.5×1.25×0.32
=2.5×1.25×4×0.8
=(2.5×4)×(1.25×0.8)
=10×1
=10
(3)2.4÷2.5÷4
=2.4÷(2.5×4)
=2.4÷10
=0.24
(4)3.8×1.01
=3.8×(1+0.01)
=3.8×1+3.8×0.01
=3.8+3.838
(5)5.95÷(1.24+0.46)×5
=5.95÷1.7×5
=3.5×5
=17.5
(6)0.648÷[(0.5+0.4)×0.6]
=0.648÷[0.9×0.6]
=0.648÷0.54
=1.2
點(diǎn)評(píng):此題考查的目的是理解掌握小數(shù)四則混合運(yùn)算的順序以及它們的計(jì)算法則,并且能夠靈活選擇簡(jiǎn)便方法進(jìn)行計(jì)算.