用边长3分米的方砖给一间教室铺地，要600块，如果改用边长4分米的方砖来铺，需要多少块？（用比例解）
直接写得数： 3﹣=÷=×=÷6= 9.1÷7=÷=+=÷= 4×=×=
直接写出得数． 3×=×=+= 16×=÷= 1﹣= 9÷= 0÷110=
直接写得数．×16= 12÷= 0.3×=÷= 1÷=×÷=×÷×= 0×+=﹣=+=×=÷=
5×= 11×1=÷4= 9×4.5+4.5=÷= 1=×27= 5.6+8×1= 8×4= 12÷6= 3﹣1= 5﹣2+=
直接写出得数×=×=÷3= 16×=+=×÷=×÷×= 1÷3×=÷= 5÷﹣5÷=
=
÷
=
×
=
÷6= 9.1÷7=
÷
+
=
÷
= 4×
=
×
=
=
×
=
+
= 16×
=
÷
= 1﹣
= 9÷
= 0÷110
=
×16= 12÷
= 0.3×
=
=
=
×
÷
×
÷
×
+
=
﹣
=
+
=
×
=
÷
=
= 11×1
=
÷4= 9×4.5+4.5=
÷
= 1
=
×27= 5.6+8×1
= 8×4
= 12
÷6= 3
﹣1
= 5﹣2
+
=
×
=
×
=
÷3= 16×
=
+
=
×
÷
=
×
÷
÷
= 5÷
﹣5÷
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