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МегаЛекции

Умножение и деление положительных и отрицательных чисел




МНОЖИТЕЛЬ(ДЕЛИМОЕ) МНОЖИТЕЛЬ(ДЕЛИТЕЛЬ) ПРОИЗВЕДЕНИЕ(ЧАСТНОЕ)
+/ + + /+ +/ +
+/ + -/ - -/-
-/ - +/ + -/ -
- /- -/ - +/+

ПРИВЕДЕНИЕ ПОДОБНЫХ СЛАГАЕМЫХ

Подобные слагаемые – это слагаемые, имеющие одинаковую буквенную часть: 25х и 0,4х; 8 mи 100m; 6 а и 7,11а

Чтобы привести подобные слагаемые, нужно сложить их коэффициенты и результат умножить на общую буквенную часть

· 6х – 2х + 4х = 8х

6 – 2 + 4 = 8

· 18а + 10а – а = 27а

18 + 10 – 1 = 27

· – у + 11у – = -6а + 10у

5 – 9 – 2 = -6; -1 + 11 = 10

РАСКРЫТИЕ СКОБОК

«+» оставляй знак!
Чтобы раскрыть скобки, перед которыми стоит знак «+», нужно убрать скобки, оставив все слагаемые в скобках со своими знаками (если перед первым слагаемым в скобке знака нет, то подразумевается «+»).

· (-21х + 47 – 5х) = -21х + 47 – 5х = -26х + 47;

· 11а + (5у + 5х – 5а) = 11а + 5у + 5х – 5а = 6а + 5х + 5у;

«-» меняй знак!
Чтобы раскрыть скобки, перед которыми стоит знак «-», нужно убрать скобки, поменяв знаки всех слагаемых в скобках на противоположные.

· - (-21х + 47 – 5х) = 21х – 47 + = 26х – 47;

· 11а – (5у + 5х – 5а) = 11а – 5у – 5х + = 16а -5у – 5х.

РЕШЕНИЕ УРАВНЕНИЙ

Уравнения решаются по следующему алгоритму

Дано уравнение 7х – (12 + 3х) = 4(х – 3) – 2х + 10
Раскрыть скобки 7х – 12 – 3х = 4х – 12 – 2х + 10
Перенести в левую часть уравнения неизвестные слагаемые, а в правую – известные (при переносе поменять знак!) 7х – 3х – 4х + 2х = -12 + 10 + 12
Привести подобные слагаемые 2х = 10
Найти корень уравнения Х = 10: 2 Х = 5

КООРДИНАТЫ НА ПЛОСКОСТИ

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M(3;2)
 
B(-4;3)
 
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-2
L t1UKDXHTtVBSKC5JzEtJzMnPS7VVqkwtVrK34+UCAAAA//8DAFBLAwQUAAYACAAAACEAyUfrvcEA AADbAAAADwAAAGRycy9kb3ducmV2LnhtbESPQWvCQBSE7wX/w/IKvdWNoiKpq4hW8OBFjfdH9jUb mn0bsq8m/vuuUOhxmJlvmNVm8I26UxfrwAYm4wwUcRlszZWB4np4X4KKgmyxCUwGHhRhsx69rDC3 oecz3S9SqQThmKMBJ9LmWsfSkcc4Di1x8r5C51GS7CptO+wT3Dd6mmUL7bHmtOCwpZ2j8vvy4w2I 2O3kUXz6eLwNp33vsnKOhTFvr8P2A5TQIP/hv/bRGpjN4fkl/QC9/gUAAP//AwBQSwECLQAUAAYA CAAAACEA8PeKu/0AAADiAQAAEwAAAAAAAAAAAAAAAAAAAAAAW0NvbnRlbnRfVHlwZXNdLnhtbFBL AQItABQABgAIAAAAIQAx3V9h0gAAAI8BAAALAAAAAAAAAAAAAAAAAC4BAABfcmVscy8ucmVsc1BL AQItABQABgAIAAAAIQAzLwWeQQAAADkAAAAQAAAAAAAAAAAAAAAAACkCAABkcnMvc2hhcGV4bWwu eG1sUEsBAi0AFAAGAAgAAAAhAMlH673BAAAA2wAAAA8AAAAAAAAAAAAAAAAAmAIAAGRycy9kb3du cmV2LnhtbFBLBQYAAAAABAAEAPUAAACGAwAAAAA= " filled="f" stroked="f">
-3
L t1UKDXHTtVBSKC5JzEtJzMnPS7VVqkwtVrK34+UCAAAA//8DAFBLAwQUAAYACAAAACEAOZV1ysIA AADbAAAADwAAAGRycy9kb3ducmV2LnhtbESPzWrDMBCE74W+g9hAbo2c0obgRDahP5BDL02c+2Jt LBNrZaxt7Lx9VCj0OMzMN8y2nHynrjTENrCB5SIDRVwH23JjoDp+Pq1BRUG22AUmAzeKUBaPD1vM bRj5m64HaVSCcMzRgBPpc61j7chjXISeOHnnMHiUJIdG2wHHBPedfs6ylfbYclpw2NObo/py+PEG ROxueas+fNyfpq/30WX1K1bGzGfTbgNKaJL/8F97bw28rOD3S/oBurgDAAD//wMAUEsBAi0AFAAG AAgAAAAhAPD3irv9AAAA4gEAABMAAAAAAAAAAAAAAAAAAAAAAFtDb250ZW50X1R5cGVzXS54bWxQ SwECLQAUAAYACAAAACEAMd1fYdIAAACPAQAACwAAAAAAAAAAAAAAAAAuAQAAX3JlbHMvLnJlbHNQ SwECLQAUAAYACAAAACEAMy8FnkEAAAA5AAAAEAAAAAAAAAAAAAAAAAApAgAAZHJzL3NoYXBleG1s LnhtbFBLAQItABQABgAIAAAAIQA5lXXKwgAAANsAAAAPAAAAAAAAAAAAAAAAAJgCAABkcnMvZG93 bnJldi54bWxQSwUGAAAAAAQABAD1AAAAhwMAAAAA " filled="f" stroked="f">
-4
 
C(0;-3)
L t1UKDXHTtVBSKC5JzEtJzMnPS7VVqkwtVrK34+UCAAAA//8DAFBLAwQUAAYACAAAACEASArhuMIA AADbAAAADwAAAGRycy9kb3ducmV2LnhtbESPQWvCQBSE7wX/w/KE3upGscWmriJqwYOXarw/sq/Z 0OzbkH2a+O+7hYLHYWa+YZbrwTfqRl2sAxuYTjJQxGWwNVcGivPnywJUFGSLTWAycKcI69XoaYm5 DT1/0e0klUoQjjkacCJtrnUsHXmMk9ASJ+87dB4lya7StsM+wX2jZ1n2pj3WnBYctrR1VP6crt6A iN1M78Xex8NlOO56l5WvWBjzPB42H6CEBnmE/9sHa2D+Dn9f0g/Qq18AAAD//wMAUEsBAi0AFAAG AAgAAAAhAPD3irv9AAAA4gEAABMAAAAAAAAAAAAAAAAAAAAAAFtDb250ZW50X1R5cGVzXS54bWxQ SwECLQAUAAYACAAAACEAMd1fYdIAAACPAQAACwAAAAAAAAAAAAAAAAAuAQAAX3JlbHMvLnJlbHNQ SwECLQAUAAYACAAAACEAMy8FnkEAAAA5AAAAEAAAAAAAAAAAAAAAAAApAgAAZHJzL3NoYXBleG1s LnhtbFBLAQItABQABgAIAAAAIQBICuG4wgAAANsAAAAPAAAAAAAAAAAAAAAAAJgCAABkcnMvZG93 bnJldi54bWxQSwUGAAAAAAQABAD1AAAAhwMAAAAA " filled="f" stroked="f">
x
y
ось абсцисс
ось ординат
Как найти т.М (3;2) – три шага: 1) (0;0) – отправная точка 2) Ход по оси X (горизонтальная): для М на 3 единицы вправо 3) Ход по оси Y (вертикальная): для М на 2 единицы вверх
Точка М (3;2): 3 – абсцисса т.М, 2 – ордината т.М

 

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