(1) S=ab

(2)S=aa

(3)S三=ah÷2

(4)S平=ah

(5)S梯=(a+b)h÷2

(6)S圆=3.14rr

(7)C=(a+b)×2

(8)C=4a

(9)C圆=3.14d或2×3.14×r

(10)V=abh

(11)V立=aaa

(12)V圆柱=Sh或3.14×r×r×h

(13)V圆锥=Sh÷3

(14)S圆柱侧面积=Ch

(15)加交换律:a+b=b+a

(16)加结合律:(a+b)+c=a+(b+c)

(17)乘交换律:a×b=b×a

(18)乘结合律:(a×b)×c=a×(b×c)

(19)乘配律:ac+bc=(a+b)×c

(20)减性质:a-b-c=a-(b+c)

(21)图距离:实际距离=比例尺

(22)3.14×2=6.28

(23) 3.14×3=9.42

(24) 3.14×4=12.56

(25) 3.14×5=15.7

(26) 3.14×6=18.84

(27) 3.14×7=21.98

(28) 3.14×8=25.12

(29) 3.14×9=28.26

(30) 3.14×15=706.5

(31) 3.14×16=50.24

(32) 3.14×25=78.5

(33) 3.14×36=113.04