将下列各式写成省略加号的和的形式,并按括号内要求交换加数的位置.(1) (+16)+(-29)-(-7)-(+11)+(+9);(使符号相同的加数在一起)(2) (-3.1)-(-4.5)+(+4.4)-(+1.3)+(-2.5);(使
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![将下列各式写成省略加号的和的形式,并按括号内要求交换加数的位置.(1) (+16)+(-29)-(-7)-(+11)+(+9);(使符号相同的加数在一起)(2) (-3.1)-(-4.5)+(+4.4)-(+1.3)+(-2.5);(使](/uploads/image/z/377603-35-3.jpg?t=%E5%B0%86%E4%B8%8B%E5%88%97%E5%90%84%E5%BC%8F%E5%86%99%E6%88%90%E7%9C%81%E7%95%A5%E5%8A%A0%E5%8F%B7%E7%9A%84%E5%92%8C%E7%9A%84%E5%BD%A2%E5%BC%8F%2C%E5%B9%B6%E6%8C%89%E6%8B%AC%E5%8F%B7%E5%86%85%E8%A6%81%E6%B1%82%E4%BA%A4%E6%8D%A2%E5%8A%A0%E6%95%B0%E7%9A%84%E4%BD%8D%E7%BD%AE.%281%EF%BC%89+%EF%BC%88%2B16%EF%BC%89%2B%EF%BC%88-29%EF%BC%89-%EF%BC%88-7%EF%BC%89-%EF%BC%88%2B11%EF%BC%89%2B%EF%BC%88%2B9%EF%BC%89%EF%BC%9B%EF%BC%88%E4%BD%BF%E7%AC%A6%E5%8F%B7%E7%9B%B8%E5%90%8C%E7%9A%84%E5%8A%A0%E6%95%B0%E5%9C%A8%E4%B8%80%E8%B5%B7%EF%BC%89%EF%BC%882%EF%BC%89+%EF%BC%88-3.1%EF%BC%89-%EF%BC%88-4.5%EF%BC%89%2B%EF%BC%88%2B4.4%EF%BC%89-%28%2B1.3%29%2B%28-2.5%29%EF%BC%9B%28%E4%BD%BF)
将下列各式写成省略加号的和的形式,并按括号内要求交换加数的位置.(1) (+16)+(-29)-(-7)-(+11)+(+9);(使符号相同的加数在一起)(2) (-3.1)-(-4.5)+(+4.4)-(+1.3)+(-2.5);(使
将下列各式写成省略加号的和的形式,并按括号内要求交换加数的位置.
(1) (+16)+(-29)-(-7)-(+11)+(+9);(使符号相同的加数在一起)
(2) (-3.1)-(-4.5)+(+4.4)-(+1.3)+(-2.5);(使和为整数的加数在一起)
(3) (+1又1/4)-(+5)+(-1/3)-(+1/4)+(-5又2/3);(使分母相同或便于通分的加数在一起)
(4) (-2.4)-(-4.7)-(+0.5)+(+3.4)+(-3.5).(使计算简便)
将下列各式写成省略加号的和的形式,并按括号内要求交换加数的位置.(1) (+16)+(-29)-(-7)-(+11)+(+9);(使符号相同的加数在一起)(2) (-3.1)-(-4.5)+(+4.4)-(+1.3)+(-2.5);(使
(1) (+16)+(-29)-(-7)-(+11)+(+9);(使符号相同的加数在一起)
=16-29+7-11+9
=(16+7+9)+(-29-11)
=32+(-40)
=-8
(2) (-3.1)-(-4.5)+(+4.4)-(+1.3)+(-2.5);(使和为整数的加数在一起)
=-3.1+4.5+4.4-1.3-2.5
=(-3.1-1.3+4.4)+(4.5-2.5)
=0+2
=2
(3) (+1又1/4)-(+5)+(-1/3)-(+1/4)+(-5又2/3);(使分母相同或便于通分的加数在一起)
=1又1/4-5-1/3-1/4-5又2/3
=(1又1/4-1/4)+(-1/3-5又2/3)-5
=1+(-6)-5
=-5-5
=-10
(4) (-2.4)-(-4.7)-(+0.5)+(+3.4)+(-3.5).(使计算简便)
=-2.4+4.7-0.5+3.4-3.5
=(-2.4+3.4)+(-0.5-3.5)+4.7
=1+(-4)+4.7
=-3+4.7
=1.7