摘要:4. 填空: (1) +11=27 (2)7+ =4 + =9 (4)12+ =0 + = -15 (6) +(-13)= -6
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填空:
(1)_____+11=27; (2)7+___=4; (3)(-9)+_____=9;
(4)12+___=0; (5)(-8)+_____=-15; (6)_____+(-13)=-6;
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