20xx北师大版数学四下邮票的张数内容摘要:
那么姐姐的邮票张数 +弟弟的邮票张数 =180 解 :设弟弟有 X张邮票 , 则姐姐有 X+90张邮票 . X + 90 + X = 180 2X + 90 = 180 2X = 180 – 90 2X = 90 X = 90247。 2 X = 45 X + 90 = 45 + 90 = 135 答 :弟弟有 45张邮票 ,姐姐有 135张邮票 . 填一填 3X 2X = X +X = Y +Y = X + = 5X X = 8b2b= 2a+7a = 2X X = X 2Y 4X 9 a 2X 1 .5X 6 b。20xx北师大版数学四下邮票的张数
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