1. 在〇里填运算符号,在$\square$里填数。
$x + 15 - 26 = 80$ $23x \div 2 = 460$
解:$x + 15 = 80〇\square$ 解:$23x = 460〇\square$
$x = \square〇\square$ $x = \square〇\square$
$x = \square$ $x = \square$
$x + 15 - 26 = 80$ $23x \div 2 = 460$
解:$x + 15 = 80〇\square$ 解:$23x = 460〇\square$
$x = \square〇\square$ $x = \square〇\square$
$x = \square$ $x = \square$
答案
2. 解方程。
$77 + 3x = 122$ $5x - 1.6 = 0.9$ $6x - 13.6 = 20$
$x - 7.9 + 5.4 = 12$ $4x \div 2 = 1.8$ $0.8x \div 4 = 12.8$
$77 + 3x = 122$ $5x - 1.6 = 0.9$ $6x - 13.6 = 20$
$x - 7.9 + 5.4 = 12$ $4x \div 2 = 1.8$ $0.8x \div 4 = 12.8$
答案
3. 如图,平行四边形的面积是11.2平方米。它的高是多少米?

答案
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