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数学
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0.69+0.53+.2.47+3.1怎么简便做
人气:413 ℃ 时间:2020-04-16 02:46:30
解答
0.69+0.53+.2.47+3.1
=(0.69+3.1)+(0.53+2.47)
=4+3
=7
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1.53-3又3分之2-(-0.47)-1又3分之1=
9.7*0.47+1.53*9.7-9.7(简便计算)
(4.69*2.32+53.1*0.232)/2.32
简便计算3.53×0.25+3.47
计算:53.87×47-538.7×3.9+5387×0.92.
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