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Question

Simplify:

(1) 59+89
(2) 138-78
(3) 45+-710
(4) -107-12
(5) -134+-34
(6) -134--34
(7) 25-79
(8) -35+27


Solution

(1) 59+89

=5+89=139

(2) 138-78

=13-78=68=34

(3) 45+-710

=4×25×2+-710=810+-710=8+-710=8-710=110

(4) -107-12

=-10×27×2-1×72×7=-2014-714=-20-714=-2714

(5) -134+-34

=-13+-34=-13-34=-164=-4

(6) -134--34

=-13--34=-13+34=-104=-52

(7) 25-79

=2×95×9-7×59×5=1845-3545=18-3545=-1745

(8) -35+27

=-3×75×7+2×57×5=-2135+1035=-21+1035=-1135

Mathematics
Mathematics
Standard VII

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