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(zhuān)題:運(yùn)算順序及法則,運(yùn)算定律及簡(jiǎn)算
分析:(1)(6)運(yùn)用乘法交換律與結(jié)合律簡(jiǎn)算.
(2)先算乘法,再算減法.
(3)運(yùn)用乘法分配律簡(jiǎn)算.
(4)先算乘法,再算加法.
(5)把101看作100+1,運(yùn)用乘法分配律簡(jiǎn)算.
解答:
解:(1)2.5×3.7×0.4
=(2.5×0.4)×3.7
=1×3.7
=3.7;
(2)13.7×3-36
=41.1-36
=5.1;
(3)3.07×99+3.07
=3.07×(99+1)
=3.07×100
=307;
(4)3.6×13+0.8
=46.8+0.8
=47.6;
(5)0.37×101
=0.37×(100+1)
=0.37×100+0.37
=37+0.37
=37.37;
(6)0.125×0.25×0.8×4
=(0.125×0.8)×(0.25×4)
=0.1×1
=0.1.
點(diǎn)評(píng):完成此題,注意運(yùn)算順序和運(yùn)算法則,以及運(yùn)用運(yùn)算定律進(jìn)行簡(jiǎn)便計(jì)算.