方程的意义人教新课标五年级数学上册敖汉旗新惠六小
先乘2,再加上3,再把所得的和乘5,最后减去25。
50g50g
50g50g
50g50g100g
50g50g100g
50g50g100g
50g50g100g
50g50g100g
50g50g100g
平衡100g100g
100g
100g100+x
100+x100g50g100g100g
100g100g100g100+x50g100g100g100g
100g100g100g50g100+x
100g100g100g50g100+x平衡
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(1)50﹢50﹦100(2)100﹢X﹥200(3)100﹢X﹤300(4)100﹢X﹦250(5)3X﹦2.4(6)1827(8)18+x72y+245x+32=4728