×= 12÷= ×6.8= 1÷×=
0÷= -= ÷= ×÷×=
÷4= ×8= ÷0.4= 1.1×=
÷= ×= 0.52= 478÷83≈
16:32 0.3:0.45 : :14
×5= ÷ = ÷8=
0÷ = × = ×1.5=
4×= ÷3= 75%-= 0×= ×=
+= ÷= 1.25×0.8= 1÷30%= 12--=
× = × = × = 1.2× =
÷4= 42÷ = ÷ = ÷0.1=
×9= = ÷4= =
如图所示,长桌像这样拼下去,5张桌子拼在一起可以坐人,n张桌子拼在一起可以坐人。