早教吧作业答案频道 -->数学-->
计算(1)22+(-5)-(-2)+8(2)1213×(-20)+113×(-20)(3)(16-27+23)÷(-142)(4)(-21.6)+3-7.4+(-0.4)
题目详情
计算
(1)22+(-5)-(-2)+8
(2)
×(-20)+
×(-20)
(3)(
-
+
)÷(-
)
(4)(-21.6)+3-7.4+(-0.4)
(1)22+(-5)-(-2)+8
(2)
12 |
13 |
1 |
13 |
(3)(
1 |
6 |
2 |
7 |
2 |
3 |
1 |
42 |
(4)(-21.6)+3-7.4+(-0.4)
▼优质解答
答案和解析
(1)22+(-5)-(-2)+8
=(22+2+8)-5
=27;
(2)
×(-20)+
×(-20)
=-20×(
+
)
=-20;
(3)(
-
+
)÷(-
)
=-
×42+
×42-
×42
=-7+12-28
=-23;
(4)(-21.6)+3-7.4+(-0.4)
=-(21.6+0.4+7.4)+3
=-29.4+3
=-26.4.
=(22+2+8)-5
=27;
(2)
12 |
13 |
1 |
13 |
=-20×(
12 |
13 |
1 |
13 |
=-20;
(3)(
1 |
6 |
2 |
7 |
2 |
3 |
1 |
42 |
=-
1 |
6 |
2 |
7 |
2 |
3 |
=-7+12-28
=-23;
(4)(-21.6)+3-7.4+(-0.4)
=-(21.6+0.4+7.4)+3
=-29.4+3
=-26.4.
看了 计算(1)22+(-5)-(...的网友还看了以下:
直接写得数.2.8÷0.4=38+38=0.21×0.3=811-511=0.42÷0.6=1.2 2020-04-07 …
27/7*9/27-13/7÷21/19简便计算 2020-05-13 …
MATLAB最小二乘法拟合曲线x=[0.11 0.13 0.19 0.21 0.27 0.37 0 2020-05-16 …
计算(1+0.21+0.32)x(0.21+0.32+0.43)-(1+0.21+0.32+0.4 2020-05-17 …
(0.1+0.21+0.31)*(0.21+0.31+0.41)-(0.1+0.21+0.31+0 2020-06-06 …
计算:(1)299.9×19.98-199.8×29.97;(2)3.14+64.8×0.537× 2020-07-09 …
用简便方法计算下面各题.87+12一+13+7得一87-(187+21得)121×一8一27×人人 2020-07-18 …
用简便方法计算(1)0.9999×0.7+0.1111×2.7;(2)(1+0.228-0.21) 2020-07-19 …
已知样本:2018201816232120221722191918221921202120.那么频 2020-08-02 …
英语翻译*DIM,TIMESTEP,ARRAY,18,*VFILL,TIMESTEP(1),DATA 2020-11-01 …