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(-7)(-5)-90 ÷(-15) ; 1 ÷(-1)+0 ÷4-(-4)(-1) ;
1. 计算 - ×(-) ×() ÷(-) ; (-3) ×(-5)
18+32÷(-2)3-(-4)2 ×5. (-12)2 ÷(-4)3-2 ×(-1)2n-1 ;
2; (-3)2-(-6) ; (-4 ×32)-(-4 ×3) (-8 ÷23)-(-8 ÷2)
〔(-2)4+(-4)2 ?(-1)7 〕2m?(53+35) .
3. (-2)2-(-52) ×(-1)5+87 ÷(-3) ×(-1)
( - 6) -( -7)+( -5) -(+9)
4. -9+5 ×(-6)-(-4)2 ÷(-8) ; 2 ×(-3)3-4 ×(-3)+1
( -5) ×( -3 ) -15×1 + 〔 -( ) ×24〕 -7+3-6 ;
5. -8+4 ÷(-2) ; 6-(-12) ÷(-3) ; 3 ?(-4)+(-28) ÷7;
(-3) ×(-8) ×25; (-616) ÷(-28) ; -100-27 ;
。
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2.. (1)-+(-1/5
) ( 2) - (-1/4 )+1/6
(3)1/3- (-5/6 ) 12×5/6 –2/9 ×3
8
×5/4 + 1/4 6÷3/8
–3/8 ÷6
+2/3
4/7 ×5/9 + 3/7
×5/9
5/2 -( 3/2 + 4/5
)
(4) 1/3+ (-1/5 )+1+2/3 ( 5)27-18+( -7 )-32 5 7/8 + ( 1/8 + 1/9 ) 9 ×5/6 + 5/6 3/4 ×8/9 - 1/3
7 ×5/49 + 3/14 6 ×( 1/2 + 2/3 )
(6)+ ( -1/4 ) - ( - )+1/2
3. (1)- ( - )+(- ) (2)(-8 )- (-15 )+(-9 )- ( -12 ) 8 ×4/5 + 8 ×11/5 31 ×5/6 –5/6
9/7 - ( 2/7 –10/21 ) 5/9 ×18 –14 ×2/7
(3)-2/3+ (-1/6 )- (-1/4 )-1/2 (4)3/5-3/2+(-11/4)+13/4
4/5 ×25/16 + 2/3 ×3/4 14 ×8/7 –5/6 ×12/15 )
(5).125*3+125*5+25*3+25
17/32 –3/4 ×9/24 3 ×2/9 + 1/3
4 3/7 ×49/9 - 4/3 8/9
×15/36 + 1/27
。
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5/7