摘要: 下列交换加数位置的变形是否正确? (1) 1-4+5-4=1-4+4-5 ; (2) 1-2+3-4=2-1+4-3; (1)4.5-1.7-2.5+1.8=4.5-2.5+1.8-1.7; (4)
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下列交换加数位置的变形是否正确?
(1)1-4+5-4=1-4+4-5;
(2)1-2+3-4=2-1+4-3;
(3)4.5-1.7-2.5+1.8=4.5-2.5+1.8-1.7;
(4)-
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(1)1-4+5-4=1-4+4-5;
(2)1-2+3-4=2-1+4-3;
(3)4.5-1.7-2.5+1.8=4.5-2.5+1.8-1.7;
(4)-
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