1÷= ×= ÷= ×2=
+= ÷= ÷0.5= ×30%=
0.65:0.5 时:25分 144:72
⑴48:72 ⑵2.4:6 ⑶0.15:0.2 ⑷
2.64+3.6=
2.4×50=
2+7÷9=
0.3÷3%=
+= 5÷= ×= ×÷=
÷3= += -= ×÷×=
÷= ×= 12×= + ×=
÷= ÷= 0×= =
×9= ÷ = 0÷ =
- = × = ÷ =
20÷ = ÷( - )=
所受拉力
5N
6N
8N
10N
……
弹簧伸长
2cm
2.4cm
3.2cm
4cm