30÷ = × = ÷ = ÷3÷ =
0.75÷ = ÷ ×9= 3.14×62= + ÷ - =
① × ÷
②( ÷ +0.8)×
③ ÷7+ ×
④24×( + +25%)
⑤ +( + )×
⑥ ÷(5- - )
上图,每个小正方形的对角线长10m。
S阴影=S正-S圆=8×8-π×42=64-50.24=13.76