1.下列交换加数位置的变形中,正确的是( ).(A)1-4+5-4=1-4+4-5 (B)(-1/3)+(3/4)-(1/6)-(¼)=(¼)+(3/4)-(1/3)-(1/6)(B)1-2+3-4=2-1+4-3.(C)4.5-1.7-2.5+1.8=4.5-2.5+1.8-1.7
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![1.下列交换加数位置的变形中,正确的是( ).(A)1-4+5-4=1-4+4-5 (B)(-1/3)+(3/4)-(1/6)-(¼)=(¼)+(3/4)-(1/3)-(1/6)(B)1-2+3-4=2-1+4-3.(C)4.5-1.7-2.5+1.8=4.5-2.5+1.8-1.7](/uploads/image/z/4027738-58-8.jpg?t=1.%E4%B8%8B%E5%88%97%E4%BA%A4%E6%8D%A2%E5%8A%A0%E6%95%B0%E4%BD%8D%E7%BD%AE%E7%9A%84%E5%8F%98%E5%BD%A2%E4%B8%AD%2C%E6%AD%A3%E7%A1%AE%E7%9A%84%E6%98%AF%EF%BC%88+%EF%BC%89.%EF%BC%88A%EF%BC%891-4%2B5-4%3D1-4%2B4-5+%EF%BC%88B%EF%BC%89%28-1%2F3%29%2B%283%2F4%29-%281%2F6%29-%28%26frac14%3B%29%3D%28%26frac14%3B%29%2B%283%2F4%29-%281%2F3%29-%281%2F6%29%EF%BC%88B%EF%BC%891-2%2B3-4%3D2-1%2B4-3.%EF%BC%88C%EF%BC%894.5-1.7-2.5%2B1.8%3D4.5-2.5%2B1.8-1.7)
1.下列交换加数位置的变形中,正确的是( ).(A)1-4+5-4=1-4+4-5 (B)(-1/3)+(3/4)-(1/6)-(¼)=(¼)+(3/4)-(1/3)-(1/6)(B)1-2+3-4=2-1+4-3.(C)4.5-1.7-2.5+1.8=4.5-2.5+1.8-1.7
1.下列交换加数位置的变形中,正确的是( ).(A)1-4+5-4=1-4+4-5 (B)(-1/3)+(3/4)-(1/6)-(¼)=(¼)+(3/4)-(1/3)-(1/6)(B)1-2+3-4=2-1+4-3.(C)4.5-1.7-2.5+1.8=4.5-2.5+1.8-1.7
1.下列交换加数位置的变形中,正确的是( ).(A)1-4+5-4=1-4+4-5 (B)(-1/3)+(3/4)-(1/6)-(¼)=(¼)+(3/4)-(1/3)-(1/6)(B)1-2+3-4=2-1+4-3.(C)4.5-1.7-2.5+1.8=4.5-2.5+1.8-1.7
C
分析:先把各式用加号连起来
举例:(A)1-4+5-4=+1+(-4)+5+(-4)
(B)(-1/3)+(3/4)-(1/6)-(1/4)=+(-1/3)+(3/4)+[-(1/6)]+[-(1/4)]
(D)4.5-1.7-2.5+1.8=+4.5+(-1.7)+(-2.5)+1.8
然后就可以把"+"后的数乱颠倒顺序了(带括号哦),完后去掉括号就可以了.PS:只有"+"后的数乱颠倒顺序,"-"是不可以的(把负数前弄成"+"就可以了)!
举例:(A)1-4+5-4=+1+(-4)+5+(-4)=+1+(-4)+(-4)+5=1-4-4+5
(B)(-1/3)+(3/4)-(1/6)-(1/4)=+(-1/3)+(3/4)+[-(1/6)]+[-(1/4)]=[-(1/4)]+(3/4)+(1/3)+[-(1/6)]=-(1/4)+(3/4)+(1/3)-(1/6)
熟练后就可以直接带负号乱颠倒顺序了!