文档介绍：×3÷×3 25×7×4
34÷4÷ ÷×
102×÷ 17+-7
1--
,
a+b+c=a+ (b + c ), a+b-c=a +(b-c),
a-b+c=a –(b-c), a-b-c= a-( b +c);
933-- --
7-3+ 8+2-
11+7+3
a×b×c=a×(b×c), a×b÷c=a×(b÷c), a÷b÷c=a÷(b×c) , a÷b×c=a÷(b÷c),
700÷14÷5 ÷÷
÷÷4 ××4
13×÷ 29÷×
a+ (b + c )= a+b+c a +(b-c)= a+b-c
a –(b-c)= a-b+c a-( b +c)= a-b-c;
-(+) +(+)
-(+) 7+(-)
5-(-)
a×(b×c) = a×b×c, a×(b÷c) = a×b÷c,
a÷(b×c) = a÷b÷c , a÷(b÷c) = a÷b×c,
×( 8 ÷) ×( 4 × )
×( 213×) ÷(4÷) ÷(71×)
24×(--+) (12+) ×7 (7-)×
×+× ×-×
×-× ×+×
9999+999+99+9 4821-998
××25 ×88 ×
÷ ÷
=÷
=×4。
=
×99+ ×+
×103-×2- ×
102× ×
×31+ ×+÷
×36 ×38
×27+×72+ ×+×150%+2÷
×+×25% ×-
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