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简便运算:0.8*0.6*6.5*12.5 1.69*69-0.69*69 8.5*100.2 0.45*98

来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/05/15 15:06:52
简便运算:0.8*0.6*6.5*12.5 1.69*69-0.69*69 8.5*100.2 0.45*98
简便运算:0.8*0.6*6.5*12.5 1.69*69-0.69*69 8.5*100.2 0.45*98
0.8*0.6*6.5*12.5
=(0.8*12.5)*(0.6*6.5)
=10*3.9
=39
1.69*69-0.69*69
=(1.69-0.69)*69
=1*69
=69
8.5*100.2
=8.5*(100+0.2)
=850+1.7
=851.7
0.45*98
=0.45*(100-2)
=0.45*100-0.45*2
=45-0.9
=44.1