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)![]()
=![]()
=![]()
=
.