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)從左往右依次運(yùn)算;
(2)運(yùn)用除法的性質(zhì)簡(jiǎn)算;
(3)調(diào)整運(yùn)算順序,使計(jì)算簡(jiǎn)便;
(4)先算除法,再算加法;
(5)先算括號(hào)內(nèi)的乘法,再算括號(hào)內(nèi)的減法,最后算括號(hào)外的除法;
(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)6.8×0.75÷0.5
=5.1÷0.5
=10.2
(2)0.94÷1.25÷0.8
=0.94÷(1.25×0.8)
=0.94÷1
=0.94
(3)0.5×4÷0.5×4
=(0.5÷0.5)×(4×4)
=1×16
=16
(4)29.4÷7+3.6
=4.2+3.6
=7.8
(5)(7.5-2.3×0.4)÷0.01
=(7.5-0.92)÷0.01
=6.58÷0.01
=658
(6)9÷[0.3×(8-6.5)]
=9÷[0.3×1.5]
=9÷0.45
=20
點(diǎn)評(píng):這幾道題主要考查小數(shù)加減乘除四則運(yùn)算的計(jì)算法則,以及運(yùn)用運(yùn)算定律簡(jiǎn)算.