の in addition を えて い え でどう する

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矩阵的加法和减法是矩阵的基本线性运算。对于两个矩阵进行加法或减法运算时，这两个矩阵必须为同型矩阵，即它们的行数和列数分别相同。 若有两个m×n矩阵\(A=(a_{ij})\)和\(B=(b_{ij})\)，那么它们的和\(A + B\)是一个m×n矩阵，且\((A + B)=(a_{ij}+b_{ij})\);矩阵减法可类比加法定义，\(A - B\)也是一个m×n矩阵，\((A - B)=(a_{ij}-b_{ij})\)。例如，一个\(2×3\)的矩阵与一个\(3×2\)的矩阵不能进行加减运算;而对于两个\(2×2\)的矩阵\(\begin{pmatrix}a&b\\c&d\end{pmatrix}\)和\(\begin{pmatrix}e&f\\g&h\end{pmatrix}\)，它们相加得到\(\begin{pmatrix}a + e&b + f\\c + g&d + h\end{pmatrix}\)，相减得到\(\begin{pmatrix}a - e&b - f\\c - g&d - h\end{pmatrix}\)。

Tom had 4 apples. His friend gave him 3 more. Now he has 4 + 3 = 7 apples. He was very happy and planned to share some with his family.

1. ** Calculation Method **: - The decimals had to be aligned, which meant that the same digits had to be aligned. For example, if you calculate 3.25+1.7, the first digit after the decimal point of 3.25 is 2, and the first digit after the decimal point of 1.7 is 7. After this, you can calculate. - Starting from the lowest position, each of you must enter one out of ten. For example, if you want to calculate <1.9 + 0.8>, you first calculate <9+8 = 17>, then move one forward from ten. The first digit after the decimal point is <7>, and then calculate the integral part of <1 + 0+1 = 2>. The final result is <2.7>. - If it wasn't enough to reduce, he had to borrow from the previous digit and reduce it again. For example, if the calculation of 3.1 - 1.8, 1 - 8 is not enough, then borrow 1 from 3 to become 10, 10+1 - 8 = 3, the integral part 3 - 1 - 1 = 1, the result is 1.3. - When the minuend was an integral number, a decimal point had to be added, and then a "0" had to be added according to the decimal part of the minuend. For example,"5 - 3.25", write "5" as "5.00", and then subtract. - When calculating the addition and deduction of decimals in the vertical form, the "0" at the end of the decimal point could not be removed. When the result was written in the horizontal form, the "0" at the end of the decimal point had to be removed. For example, if you calculate the value of [3.20+1.80 = 5.00], the two [0] in the vertical form of [5.00] cannot be removed, but the result written in the horizontal form is [5]. 2. ** Simple calculation **: - Commutative law of addition: <a + b=b + a>, for example,<1.2+3.8 = 3.8+1.2 = 5>. - The law of additivity: <a + b + c=a+(b + c)>, for example,<1.2+3.8+0.5=(1.2 + 3.8)+0.5 = 5+0.5 = 5.5>. - Commutativity and association of addition: ((a + b)+c = a+(b + c)=(a + c)+b). - Subtraction properties: <a-(b + c)=a - b - c>, for example,<5-(1.2+1.8)=5 - 1.2 - 1.8 = 2>. - Other simple methods: <a-(b - c)=a - b + c=(a + c)-b>,<a - b + c - d=a + c-(b + d)>. 3. ** Same level calculation rules **: - If an equation had both addition and deduction, or if an equation only had multiplication and division, these were all operations of the same level. The normal order of calculations for the same level was from front to back. - You can also move with symbols, such as <3.6+1.4 - 1.6 = 3.6 - 1.6+1.4 = 2+1.4 = 3.4>. When adding the parenthesis, it could be operated according to the formula "add unchanged minus change", such as "5.17-(1.8 - 3.2)=5.17 - 1.8+3.2". <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Under normal conditions, there was no reaction between the two. This was because the reaction between the two substances would result in the decomposition of the two substances. Under normal conditions, the two substances would not react. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>