90÷(1+20%)÷(1-10%),
=90÷1.2÷0.9,
≈83(张);
答:兰兰收集了83张邮票.
七年级同学集邮,红红收集了90张,比明明多收集了20%,明明又比兰兰少收集了10%,兰兰收集了多少张邮票?
七年级同学集邮,红红收集了90张,比明明多收集了20%,明明又比兰兰少收集了10%,兰兰收集了多少张邮票?
数学人气:858 ℃时间:2019-10-17 07:23:40
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