文字间的数学．（1）2个的积比多多少？（2）一个数的5倍加上3等于这个数的8倍减去16，求这个数．（用方程解）
直接写出得数 21×=÷2=×=÷=÷= 12÷= 1÷=×0=
直接写得数． 20×=÷=×=÷6=×12=×=
直接写得数．×=﹣=×=×=÷=÷=÷=÷=
直接写得数÷=×=﹣=×1.4= 12×= 24×=+= 0÷=
直接写得数== 3÷========
的积比
多多少？
=
÷2=
×
=
÷
=
÷
= 12÷
= 1÷
=
×0=
=
÷
=
×
=
÷6=
=
×
﹣
=
×
=
×
=
÷
=
÷
=
÷
=
÷
=
÷
=
×
=
﹣
=
×1.4=
= 24×
=
+
= 0÷
=
=
= 3÷
=
=
=
=
=
=
=
=
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