Bài 2: Tính giá trị biểu thức
781 + 404 : 4
204 - 826 : 7
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a)
5 406 x 2 x 4
= 10 812 x 4
= 43 248
b)
370 + 9 826 + 6 530
= 10 196 + 6 530
= 16 726
a) 417 – (37 – 20) = 417 – 17
= 400
b) 826 – (70 + 30) = 826 – 100
= 726
c) 148 : (4 : 2) = 148 : 2
= 4
d) ( 30 + 20) x 5 = 50 x 5
= 250
a) 7 479 + 3 204 × 5 = 7 479 + 16 020 = 23 499
b) 24 516 – 64 548 : 3 = 24 516 – 21 516 = 3000
c) 14 738 + 460 + 3 240 = 15 198 + 3240 = 18 438
d) 9015 × 3 × 2 = 27 045 × 2 = 54 090
2:
a: \(=\dfrac{1}{3}\left(-\dfrac{4}{5}-\dfrac{6}{5}\right)=-\dfrac{1}{3}\cdot2=-\dfrac{2}{3}\)
1:
\(A=7-\dfrac{3}{4}+\dfrac{1}{3}-6-\dfrac{5}{4}+\dfrac{4}{3}-5+\dfrac{7}{4}-\dfrac{5}{3}\)
\(=-4-\dfrac{1}{4}=-\dfrac{17}{4}\)
Bài 1:
\(A=\left(7-\dfrac{3}{4}+\dfrac{1}{3}\right)-\left(6+\dfrac{5}{4}-\dfrac{4}{3}\right)-\left(5-\dfrac{7}{4}+\dfrac{5}{3}\right)\)
\(A=7-\dfrac{3}{4}+\dfrac{1}{3}-6-\dfrac{5}{4}+\dfrac{4}{3}-5+\dfrac{7}{4}-\dfrac{5}{3}\)
\(A=\left(7-6-5\right)-\left(\dfrac{3}{4}+\dfrac{5}{4}-\dfrac{7}{4}\right)+\left(\dfrac{1}{3}+\dfrac{4}{3}-\dfrac{5}{3}\right)\)
\(A=-4-\dfrac{3+5-7}{4}+\dfrac{1+4-5}{3}\)
\(A=-4-\dfrac{1}{4}+\dfrac{0}{3}\)
\(A=-\dfrac{16}{4}-\dfrac{1}{4}+0\)
\(A=\dfrac{-16-1}{4}\)
\(A=-\dfrac{17}{4}\)
Bài 2:
\(\dfrac{1}{3}\cdot-\dfrac{4}{5}+\dfrac{1}{3}\cdot-\dfrac{6}{5}\)
\(=\dfrac{1}{3}\cdot\left(-\dfrac{4}{5}-\dfrac{6}{5}\right)\)
\(=\dfrac{1}{3}\cdot\dfrac{-4-6}{5}\)
\(=\dfrac{1}{3}\cdot\dfrac{-10}{5}\)
\(=\dfrac{1}{3}\cdot-2\)
\(=-\dfrac{2}{3}\)
a. 2205 - (35 . 7)
= 2205 - 245
= 1960
b. 8700 : 25 . 4
= 348 . 4
= 1392
a)781+404:4
=781+101
=882
b)204-826:7
=204-118
=86
HT
= 882
= 86