(2)﹣÷(﹣)×(﹣1)=﹣÷=20+36 =56.
30.计算:
×(﹣1)+4×9
42015
+(﹣2)×(﹣3)
22
(1)6+(﹣8)+9﹣(+11)﹣|﹣4| (2)(3)(4)(5)(6)(7)(8)
.
【解答】解:(1)6+(﹣8)+9﹣(+11)﹣|﹣4| =6﹣8+9﹣11﹣4 =(6+9)﹣(11+4)﹣8 =15﹣15﹣8 =﹣8; (2)
=﹣2﹣17﹣10+9+4﹣7 =﹣16﹣7 =﹣23;
(3)=﹣
×8×
×
=﹣13; (4)
=﹣81÷×÷16 =﹣81×××=﹣1; (5)
=﹣1﹣××(2﹣9) =﹣1﹣×(﹣6) =﹣1+1 =0; (6)=(﹣20+=120﹣ =119; (7)=(﹣
+
)×(﹣6)
﹣)×(﹣42)
×(﹣42)+
×(﹣42)﹣×(﹣42)
=×(﹣42)﹣=﹣12+10﹣9+12 =1 (8)=[
﹣(×36﹣
×36+×36)]÷(﹣14)
=[=(=﹣=﹣
﹣(28﹣33+6)]÷(﹣14) ﹣1)×(﹣×
)