数学拓展题
简便运算1.5623-(623-289)+452-(352-211)2.612-375+275+(388-286)3.736+678+2386-(336+278)-186...
简便运算
1.5623-(623-289)+452-(352-211)
2.612-375+275+(388-286)
3.736+678+2386-(336+278)-186
请帮忙啦,在线等着哦! 展开
1.5623-(623-289)+452-(352-211)
2.612-375+275+(388-286)
3.736+678+2386-(336+278)-186
请帮忙啦,在线等着哦! 展开
1个回答
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1. 5623-623+289+452-352+211
=5000+289+211+100
=5000+500+100
=5600
2. 612-375+275+388-286
=612+388-375+275-286
=1000-100-286
=900-286
=614
3. 736+678+2386-336-278-186
=736-336+678-278+2386-186
=400+400+2200
=3000
=5000+289+211+100
=5000+500+100
=5600
2. 612-375+275+388-286
=612+388-375+275-286
=1000-100-286
=900-286
=614
3. 736+678+2386-336-278-186
=736-336+678-278+2386-186
=400+400+2200
=3000
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