有理数的加减混合运算。 急啊!!!!!!!!!!!!!!!!
7.5+(-2又1/3)-(22.5)+(-6又2/3);(+0.75)+(-2.8)+(-0.2)-1.25;-1/3-(-2又1/2)+(-3又1/4)-(+5又1/...
7.5+(-2又1/3)-(22.5)+(-6又2/3);
(+0.75)+(-2.8)+(-0.2)-1.25;
-1/3-(-2又1/2)+(-3又1/4)-(+5又1/6);
-|-3/5-(-2/5)|+|(-1/4)+(-1/2)|; 展开
(+0.75)+(-2.8)+(-0.2)-1.25;
-1/3-(-2又1/2)+(-3又1/4)-(+5又1/6);
-|-3/5-(-2/5)|+|(-1/4)+(-1/2)|; 展开
展开全部
7.5+(-2又1/3)-(22.5)+(-6又2/3)
=7.5-22.5-7/3-20/3
=-15-9
=-24
(+0.75)+(-2.8)+(-0.2)-1.25
=0.75-1.25-2.8-0.2
=-0.5-3
=-3.5
-1/3-(-2又1/2)+(-3又1/4)-(+5又1/6)
=-1/3+5/2-13/4-31/6
=-1/3-3/4-31/6
=-(4+9+62)/12
=-25/4
-|-3/5-(-2/5)|+|(-1/4)+(-1/2)|
=-|-1/5|+|-3/4|
=-1/5+3/4
=11/20
=7.5-22.5-7/3-20/3
=-15-9
=-24
(+0.75)+(-2.8)+(-0.2)-1.25
=0.75-1.25-2.8-0.2
=-0.5-3
=-3.5
-1/3-(-2又1/2)+(-3又1/4)-(+5又1/6)
=-1/3+5/2-13/4-31/6
=-1/3-3/4-31/6
=-(4+9+62)/12
=-25/4
-|-3/5-(-2/5)|+|(-1/4)+(-1/2)|
=-|-1/5|+|-3/4|
=-1/5+3/4
=11/20
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展开全部
7.5+(-2又1/3)-(22.5)+(-6又2/3);
=7.5-22.5-(2又1/3+6又2/3)
=-15-9
=-24
(+0.75)+(-2.8)+(-0.2)-1.25;
=0.75-1.25-(2.8+0.2)
=-0.5-3
=-3.5
-1/3-(-2又1/2)+(-3又1/4)-(+5又1/6);
=-1/3-5又1/6+2又1/2-3又1/4
=-5又1/2-3/4
=-6又1/4
-|-3/5-(-2/5)|+|(-1/4)+(-1/2)|;
=-I-1/5I+I-3/4I
=-1/5+3/4
=11/20
=7.5-22.5-(2又1/3+6又2/3)
=-15-9
=-24
(+0.75)+(-2.8)+(-0.2)-1.25;
=0.75-1.25-(2.8+0.2)
=-0.5-3
=-3.5
-1/3-(-2又1/2)+(-3又1/4)-(+5又1/6);
=-1/3-5又1/6+2又1/2-3又1/4
=-5又1/2-3/4
=-6又1/4
-|-3/5-(-2/5)|+|(-1/4)+(-1/2)|;
=-I-1/5I+I-3/4I
=-1/5+3/4
=11/20
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展开全部
7.5+(-2又1/3) -(22.5)+(-6又2/3)
=7.5 -22.5+(-2又1/3-6又2/3)
=-15-9
=-24
(+0.75)+(-2.8)+(-0.2)-1.25
=0.75-1.25+(-2.8-0.2)
=-0.5-3
=-3.5
-1/3-(-2又1/2)+(-3又1/4)-(+5又1/6)
=-1/3-5又1/6+2又1/2-3又1/4
=4-3又1/4
=3/4
-|-3/5-(-2/5)|+|(-1/4)+(-1/2)|
=-1+3/4
=-1/4
=7.5 -22.5+(-2又1/3-6又2/3)
=-15-9
=-24
(+0.75)+(-2.8)+(-0.2)-1.25
=0.75-1.25+(-2.8-0.2)
=-0.5-3
=-3.5
-1/3-(-2又1/2)+(-3又1/4)-(+5又1/6)
=-1/3-5又1/6+2又1/2-3又1/4
=4-3又1/4
=3/4
-|-3/5-(-2/5)|+|(-1/4)+(-1/2)|
=-1+3/4
=-1/4
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展开全部
7.5+(-2又1/3)-(22.5)+(-6又2/3)
=7.5-22.5-6又2/3-2又1/3
=-15-9
=-24
(+0.75)+(-2.8)+(-0.2)-1.25;
=0.75-1.25-2.8-0.2
=-0.5-3
=-3.5
-1/3-(-2又1/2)+(-3又1/4)-(+5又1/6)
=-4/12+2又6/12-3又3/12-5又2/12
=-6又3/12
=-6又1/4
-|-3/5-(-2/5)|+|(-1/4)+(-1/2)|
=-1/5+3/4
=11/20
=7.5-22.5-6又2/3-2又1/3
=-15-9
=-24
(+0.75)+(-2.8)+(-0.2)-1.25;
=0.75-1.25-2.8-0.2
=-0.5-3
=-3.5
-1/3-(-2又1/2)+(-3又1/4)-(+5又1/6)
=-4/12+2又6/12-3又3/12-5又2/12
=-6又3/12
=-6又1/4
-|-3/5-(-2/5)|+|(-1/4)+(-1/2)|
=-1/5+3/4
=11/20
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