=18﹣44+21 =39﹣44 =﹣5;
(2)原式=﹣1﹣12÷13×(﹣8﹣4) =﹣1﹣12×3×(﹣12) =﹣1+18 =17 5.计算 (1)(
﹣
)×(﹣30);
(2)1÷(﹣1)+0÷4﹣5××(﹣2)3.
【解答】解:(1)原式=﹣1+2=1;
(2)原式=﹣1+0﹣×(﹣8) =﹣1+4 =3. 6.计算
(1)1+(﹣2)+|﹣2﹣3|﹣5﹣(﹣9) (2)(3)(
×(
)×
)×(﹣12)
(4)﹣3﹣[﹣5+(1﹣2×)÷(﹣2)].
【解答】解:(1)原式=1﹣2+5﹣5+9=8; (2)原式=
×(﹣)×
×=﹣
;
(3)原式=﹣5﹣8+9=﹣4; (4)原式=﹣3+5﹣ 7.计算:
(1)﹣20+3+5﹣7 (2)(﹣36)×(﹣+﹣
);
=.
(3)(﹣4)﹣(﹣5)+(﹣4)﹣(+3)
【解答】解:(1)﹣20+3+5﹣7=﹣27+8=﹣19 (2)(﹣36)×(﹣+﹣﹣30+21=7
(3)(﹣4)﹣(﹣5)+(﹣4)﹣(+3)=﹣4﹣3+5﹣4=﹣8+1=﹣6 8.计算
(1)﹣+3﹣﹣
(2)22+2×[(﹣3)2﹣3÷].
)=﹣36×(﹣)﹣36×﹣36×(﹣)=16
【解答】解:(1)原式=(﹣﹣)+(3﹣) =﹣1+3 =2;
(2)原式=4+2×(9﹣6) =4+6 =10.
9.计算: (1)24+(﹣22)
(2)1+(﹣)﹣(﹣)
(3)1×(﹣1)÷2 (4)(﹣3)×(﹣4)﹣|﹣10| (5)﹣14﹣(﹣5)×(6)(
+(﹣2)3 ﹣)
)×(﹣8+
【解答】解:(1)24+(﹣22)=(24﹣22)=2;
(2)1+(﹣)﹣(﹣)=1﹣+=(1++)﹣=2﹣=1; (3)1×(﹣1)÷2=﹣××=﹣; (4)(﹣3)×(﹣4)﹣|﹣10|=12﹣10=2; (5)﹣14﹣(﹣5)×(6)(
10.计算:
(1)13﹣[26﹣(﹣21)+(﹣18)] (2)(﹣1)3﹣×[2﹣(﹣3)2].
+(﹣2)3=﹣1+2﹣8=﹣7; ﹣)=×8﹣×
+×=6﹣+=
.
)×(﹣8+
【解答】解:(1)原式=13﹣26﹣21+18=31﹣47=﹣16; (2)原式=﹣1﹣×(﹣7)=﹣1+=.
11.计算. (l)
(2)
.
【解答】解:(1)原式=﹣64÷4× =﹣16× =﹣
;
(2)原式=﹣÷×18 =﹣×3×18 =﹣27.
12.计算:
(1)(﹣20)+(+3)﹣(﹣5)﹣(+7) (2)(﹣3)×(﹣4)﹣48÷|﹣6| (3)(﹣24)×(﹣﹣) (4)﹣12+×[6﹣(﹣3)2]
【解答】解:(1)原式=﹣20+3+5﹣7=﹣27+8=﹣19; (2)原式=12﹣8=4; (3)原式=﹣12+40+9=37;
(4)原式=﹣1+×(﹣3)=﹣1﹣1=﹣2.
13.计算,能简便的用简便运算. (1)23+(﹣17)+6+(﹣22). (2)(3)
.
.