9-(-11)-(-20) (-5)-(-5)(+5) (-72)-18-(-32)-(-6)
找规律填数(2,3)(5,9)(7,13)(9,);(18,10)(10,6)(20,11)(?,4);
(4分之1-6分之5+9分之7-18分之1)×(-72)=
-8+9;-15+(-6);-18+28;-21/4+2.25;12+(-5)+10+(-16);23+(-11)+6+
3,5,9,18,( ),( ),129.
求不定积分 (1) (2) (3) (4) (5) (6) (7) ; (8) (9) (10) (11) (12)
5/6+5/12+5/20+5/30+5/42+5/56+5/72(简算)
数字推理:4,5,(),11,13 6,6,9,18,(),135
( 1)+( 2)+( 3)+( 4)+( 5)+( 6)+( 7) +( 8)+( 9)+( 10)+( 11)=0
(1+2)+(4+5+6)+(9+10+11+12)+(16+17+18+19+20)+.+(100+101+102..
72*(9分之4+12分之5-18分之11)简便
几何画板 三角函数(0,5)(3,7.5)(6,5)(9,2.5)(12,5)(15,7.5)(18,5)(21,2.5
计算题,一共6道题,(-23)-(-59)-(-3.5)/-32/-(-12)-72(-5)(-4分之1)-(-8分之5