题目内容
【题目】计算:
(1)
(2)(-36.35)+(-7.25)+26.35+(+7)
(3)(﹣99)﹣(+61)﹣(﹣52)+(﹣32)
(4) 49+(-78.21)+27+(-21.79)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13) (计算不简便不得分)
(14)| —1+(—2)| +(—1)
(15)
【答案】(1)2(2)-10(3)-140(4)-23(5)-(6)-0.6(7)-33(8)(9)-27 (10)-43.6 (11) 0(12)-5(13)-199(14)(15)
【解析】
(1)根据有理数的加减运算法则即可求解;
(2)根据有理数的加减运算法则即可求解;
(3)根据有理数的加减运算法则即可求解;
(4)根据有理数的加减运算法则即可求解;
(5)根据有理数的加减运算法则即可求解;
(6)根据有理数的加减运算法则即可求解;
(7)根据乘法分配律即可求解;
(8)根据有理数的加减运算法则即可求解;
(9)根据乘法分配律即可求解;
(10)根据乘法分配律即可求解;
(11) 根据有理数的混合运算法则即可求解;
(12)根据乘法分配律即可求解;
(13)根据乘法分配律即可求解;
(14)根据有理数的加减运算法则即可求解;
(15)根据乘法分配律即可求解.
(1)
=3-1+3+1-4
=2
(2)(-36.35)+(-7.25)+26.35+(+7)
=-36.35+26.35-7.25+7.25
=-10
(3)(﹣99)﹣(+61)﹣(﹣52)+(﹣32)
=-99-61+52-32
=-140
(4) 49+(-78.21)+27+(-21.79)
=49+27-78.21-21.79
=77-100
=-23
(5)
=
=-3-
=-
(6)
=
=-0.6
(7)
=
=
=-33
(8)
=
=
=
(9)
=-18-30+21
=-27
(10)
=
=1.4-45
=-43.6
(11)
=
=0
(12)
=14-15+11-6×(-1.45+3.95)
=10-6×2.5
=-5
(13)
=
=-200+
=-199
(14)| -1+(-2)| +(-1)
=1+2-1
=
=
=
(15)
=
=
=.