计算下面各题,怎样简便就怎样算,并写出必要的简算过程.?
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解题思路:(1)先算乘法,再算加法,最后算除法;
(2)根据加法交换律进行简算;
(3)按照从左向右的顺序进行计算;
(4)根据加法交换律和结合律进行简算.
(1)(0.43+0.77×2.1)÷2.3
=(0.43+1.617)÷2.3
=2.047÷2.3
=0.89;
(2)[9/10]-[7/9]+[1/10]
=[9/10]+[1/10]-[7/9]
=1-[7/9]
=[2/9];
(3)[11/12]+[5/24]-[3/4]
=[9/8]-[3/4]
=[3/8];
(4)[2/3]+[1/4]-[2/3]-[1/4]
=([2/3]-[2/3])+([1/4]-[1/4])
=0+0
=0.
,4,计算下面各题,怎样简便就怎样算,并写出必要的简算过程.
(1)(0.43+0.77×2.1)÷2.3
(2)[9/10]_[7/9]+[1/10]
(3)[11/12]+[5/24]_[3/4]
(4)[2/3]+[1/4]_[2/3]_[1/4].
(2)根据加法交换律进行简算;
(3)按照从左向右的顺序进行计算;
(4)根据加法交换律和结合律进行简算.
(1)(0.43+0.77×2.1)÷2.3
=(0.43+1.617)÷2.3
=2.047÷2.3
=0.89;
(2)[9/10]-[7/9]+[1/10]
=[9/10]+[1/10]-[7/9]
=1-[7/9]
=[2/9];
(3)[11/12]+[5/24]-[3/4]
=[9/8]-[3/4]
=[3/8];
(4)[2/3]+[1/4]-[2/3]-[1/4]
=([2/3]-[2/3])+([1/4]-[1/4])
=0+0
=0.
,4,计算下面各题,怎样简便就怎样算,并写出必要的简算过程.
(1)(0.43+0.77×2.1)÷2.3
(2)[9/10]_[7/9]+[1/10]
(3)[11/12]+[5/24]_[3/4]
(4)[2/3]+[1/4]_[2/3]_[1/4].
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