计算.①100-98+96-94+92-90+…+8-6+4-2②1001×1001-1001③14+15+16+…+4
来源:学生作业帮 编辑:大师作文网作业帮 分类:综合作业 时间:2024/11/12 22:16:36
计算.
①100-98+96-94+92-90+…+8-6+4-2
②1001×1001-1001
③14+15+16+…+45+46
④99999×26+33333×22.
①100-98+96-94+92-90+…+8-6+4-2
②1001×1001-1001
③14+15+16+…+45+46
④99999×26+33333×22.
①100-98+96-94+92-90+…+8-6+4-2
=(100+96+92+…+4)-(98+94+…+2)
=(100+4)×[(100-4)÷4+1]÷2-(98+2)×[(98-2)÷4+1]÷2,
=104×[96÷4+1]÷2-100×[96÷4+1]÷2,
=104×25÷2-100×25÷2,
=1300-1250,
=50;
②1001×1001-1001
=(1001-1)×1001,
=1000×1001,
=1001000;
③14+15+16+…+45+46
=(14+46)×33÷2,
=60×33÷2,
=990;
④99999×26+33333×22
=33333×3×26+33333×22,
=(3×26+22)×33333,
=(78+22)×33333,
=100×33333,
=3333300.
=(100+96+92+…+4)-(98+94+…+2)
=(100+4)×[(100-4)÷4+1]÷2-(98+2)×[(98-2)÷4+1]÷2,
=104×[96÷4+1]÷2-100×[96÷4+1]÷2,
=104×25÷2-100×25÷2,
=1300-1250,
=50;
②1001×1001-1001
=(1001-1)×1001,
=1000×1001,
=1001000;
③14+15+16+…+45+46
=(14+46)×33÷2,
=60×33÷2,
=990;
④99999×26+33333×22
=33333×3×26+33333×22,
=(3×26+22)×33333,
=(78+22)×33333,
=100×33333,
=3333300.
计算:100-98+96-94+92-90+……+8-6+4-2=( )
计算:98+94+90+86+…+2-100-96-92-88-…-4.
100-98+96-94+92-90.+8-6+4-2怎么简便计算
简便计算:98+97-96-95+94+93-92-91+90+89…-4-3+2+1.
2+4+6+8+10+…+96+98+100 等于多少啊,需要计算过程
2+4+6+8+10+.+96+98+100用拖式计算
计算2+4+6+8+10+...+96+98+100
编程计算sum=2+4+6+8+…+100
(2+5+8+…+1001)—(1+4+7+…+1000)怎样用简便方法计算
“100×100-98×98+96×96-94×94+92×92-90×90+……+4×4-2×2”的简便计算过程
2+4+6+8+10.+94+96+98+100用简便方法如何计算
怎样计算2+4+8+10+……96+98+100