(1)1.25×16(2)3.15+2.64+1.36+6.85(3)14.28-1.5×0.3-3.55(4)1-2+
来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/10/04 15:28:56
(1)1.25×16
(2)3.15+2.64+1.36+6.85
(3)14.28-1.5×0.3-3.55
(4)1-2+3-4+5-6+7-8…+2001-2002+2003-2004+2005.
(2)3.15+2.64+1.36+6.85
(3)14.28-1.5×0.3-3.55
(4)1-2+3-4+5-6+7-8…+2001-2002+2003-2004+2005.
(1)1.25×16
=1.25×8×2
=10×2
=20
(2)3.15+2.64+1.36+6.85
=(3.15+6.85)+(2.64+1.36)
=10+4
=14
(3)14.28-1.5×0.3-3.55
=14.28-0.45-3.55
=14.28-(0.45+3.55)
=14.28-4
=10.28
(4)1-2+3-4+5-6+7-8…+2001-2002+2003-2004+2005
=1+(-2+3)+(-4+5)+(-6+7)+…+(-2002+2003)+(-2004+2005)
=1+1+1+…+1
=1+(2005-1)÷2
=1003.
=1.25×8×2
=10×2
=20
(2)3.15+2.64+1.36+6.85
=(3.15+6.85)+(2.64+1.36)
=10+4
=14
(3)14.28-1.5×0.3-3.55
=14.28-0.45-3.55
=14.28-(0.45+3.55)
=14.28-4
=10.28
(4)1-2+3-4+5-6+7-8…+2001-2002+2003-2004+2005
=1+(-2+3)+(-4+5)+(-6+7)+…+(-2002+2003)+(-2004+2005)
=1+1+1+…+1
=1+(2005-1)÷2
=1003.
(1)1.25×16(2)3.15+2.64+1.36+6.85(3)14.28-1.5×0.3-3.55(4)1-2+
简便算:【0.3+(2又2/3-1.25)除以2又5/6】*1又3/4
1、0.3÷4/3=2:( )=10/( )=( )/16 2、a:b=30,
数学题(加括号)(1)0.3 0.3 0.3 0.3 0.3=0(2)0.3 0.3 0.3 0.3 0.3=1(3)0
几道算术题,7-(-1/2)+1.5,(-6/5)-7-3.2+1,(-8)×1.25,(-3/16)×(8/9),7.
1、计算题:1.25×(-2)^3-[(-4)÷(-3分之2)^2+1]+(-1)^2011.
简便计算(-3.75)+2.85+(-1又4分之一)+(-2分之1)+3.15+(-2.5)
-2/3+(-1/6)-(-1/4)-1/2=?(-7.8)×1.25×(-8)=?
(-1.25)+3.85+(-3又1/4)+(-1/2)+1 .75
(1).2005-395+605 (2).1.25*1.5*8*15分之1 (3).86分之85*87 (4).8分之3
1.(3+1)(3^2+1)(3^4+1)(3^8+1)(3^16+1)
计算:3(2²+1)(2^4+1)(2^8+1)(2^16+1)