Tính nhanh
7^3x9+3^2x7^4-45x539
5x10^4+4x10^3+6x10^2+5x10+9
7\(^3\)x9+ 3\(^2\)x7\(^4\)-45 x 539
5 x10\(^4\)+4x10\(^2\)+6x10\(^{^2}\)+5x10+9
Tính nhanh nha,đag fải nộp gấp giúp nhanh nha
6x10^7+5x10^5+4x10^3x2x10
2x10=...
3x10=...
4x10=...
5x10=...
6x10=...
7x10=...
8x10=...
9x10=...
10x10=...
Nhớ viết cả phép tính nhé!Thanks
2 x 10 = 20
3 x 10 = 30
4 x 10 = 40
5 x 10 = 50
6 x 10 = 60
7 x 10 = 70
8 x 10 = 80
9 x 10 = 90
10 x 10 = 100
2x10= 20
3x10= 30
4x10= 40
5x10= 50
6x10= 60
7x10= 70
8x10= 80
9x10= 90
10x10= 100
2/5x10/7 x-3/4x10/7+5/2:2
Lời giải:
\(\frac{2}{5}\times \frac{10}{7}\times \frac{-3}{4}\times \frac{10}{7}+\frac{5}{2}:2=\frac{-30}{49}+\frac{5}{4}=\frac{125}{196}\)
Em nên gõ công thức trực quan để đề bài được rõ ràng nhé
A= 2/ 2x7+ 2/ 7X+ 2/12x17+.........................+2/52X57
B= 5+ 4/2X7 +4/7X12+..................................+ 4/52X57
C= 2/3X9+ 2/9X15+......................................+2/57X63
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
thế các bạn có trả lời đàng hoàng giùm mình ko
2x1= 3x1= 4x1= 5x1= 2:2= 3:3= 4:4= 5:5=
2x2= 3x2= 4x2= 5x2= 4:2= 6:3= 8:4= 10:5=
2x3= 3x3= 4x3= 5x3= 6:2= 9:3= 12:4= 15:5=
2x4= 3x4= 4x4= 5x4= 8:2= 12:3= 16:4= 20:5=
2x5= 3x5= 4x5= 5x5= 10:2= 15:3= 20:4= 25:5=
2x6= 3x6= 4x6= 5x6= 12:2= 18:3= 24:4= 30:5=
2x7= 3x7= 4x7= 5x7= 14:2= 21:3= 28:4= 35:5=
2x8= 3x8= 4x8= 5x8= 16:2= 24:3= 32:4= 40:5=
2x9= 3x9= 4x9= 5x9= 18:2= 27:3= 36:9= 45:5=
2x10= 3x10= 4x10= 5x10= 20:2= 30:3= 40:4= 50:5=
Help!
2 x 1 = 2 | 3 x 1 = 3 | 4 x 1 = 4 | 5 x 1 = 5 |
2 x 2 = 4 | 3 x 2 = 6 | 4 x 2 = 8 | 5 x 2 = 10 |
2 x 3 = 6 | 3 x 3 = 9 | 4 x 3 = 12 | 5 x 3 = 15 |
2 x 4 = 8 | 3 x 4 = 12 | 4 x 4 = 16 | 5 x 4 = 20 |
2 x 5 = 10 | 3 x 5 = 15 | 4 x 5 = 20 | 5 x 5 = 25 |
2 x 6 = 12 | 3 x 6 = 18 | 4 x 6 = 24 | 5 x 6 = 30 |
2 x 7 = 14 | 3 x 7 = 21 | 4 x 7 = 28 | 5 x 7 = 35 |
2 x 8 = 16 | 3 x 8 = 24 | 4 x 8 = 32 | 5 x 8 = 40 |
2 x 9 = 18 | 3 x 9 = 27 | 4 x 9 = 36 | 5 x 9 = 45 |
2 x 10 = 20 | 3 x 10 = 30 | 4 x 10 = 40 | 5 x 10 = 50 |
2x1=2 3x1=3 4x1=4 5x1=5 2:2= 1 3:3= 1 4:4=1 5:5=1
2x2= 4 3x2=6 4x2= 8 5x2=10 4:2= 2 6:3= 2 8:4=2 10:5=2
2x3=6 3x3= 9 4x3=12 5x3=15 6:2=3 9:3= 3 12:4=3 15:5=3
2x4=8 3x4=12 4x4=16 5x4=20 8:2=4 12:3=4 16:4=4 20:5=4
2x5=10 3x5= 15 4x5= 20 5x5= 25 10:2=5 15:3= 5 20:4=5 25:5=5
2x6=12 3x6=18 4x6= 24 5x6=30 12:2=6 18:3= 6 24:4=6 30:5=6
2x7= 14 3x7=21 4x7= 28 5x7=35 14:2=7 21:3=7 28:4=7 35:5=7
2x8=16 3x8=24 4x8= 32 5x8=50 16:2=8 24:3=8 32:4=8 40:5=8
2x9= 18 3x9= 27 4x9= 36 5x9=45 18:2=9 27:3= 9 36:9=9 45:5=9
2x10=20 3x10=30 4x10= 40 5x10=50 20:2=10 30:3=10 40:4= 10 50:5=10
tính nhẩm:
2x1= 3x1= 4x1= 5x1= 2:2= 3:3= 4:4= 5:5=
2x2= 3x2= 4x2= 5x2= 4:2= 6:3= 8:4= 10:5=
2x3= 3x3= 4x3= 5x3= 6:2= 9:3= 12:4= 15:5=
2x4= 3x4= 4x4= 5x4= 8:2= 12:3= 16:4= 20:5=
2x5= 3x5= 4x5= 5x5= 10:2= 15:3= 20:4= 25:5=
2x6= 3x6= 4x6= 5x6= 12:2= 18:3= 24:4= 30:5=
2x7= 3x7= 4x7= 5x7= 14:2= 21:3= 28:4= 35:5=
2x8= 3x8= 4x8= 5x8= 16:2= 24:3= 32:4= 40:5=
2x9= 3x9= 4x9= 5x9= 18:2= 27:3= 36:9= 45:5=
2x10= 3x10= 4x10= 5x10= 20:2= 30:3= 40:4= 50:5=
Help!
Xem bảng cửu chương bạn nhé
Hoặc tính bằng máy tính
.Mơn ^^
TÍNH NHANH
7 PHẦN 6 X 1 PHẦN 2 + 7 PHẦN 6 X 3 PHẦN 4 + 7 PHẦN 6 + 15 PHẦN 4
Có: \(\dfrac{7}{6}\times\dfrac{1}{2}+\dfrac{7}{6}\times\dfrac{3}{4}+\dfrac{7}{6}+\dfrac{15}{4}\)
\(=\dfrac{7}{6}\times\left(\dfrac{1}{2}+\dfrac{3}{4}+1\right)+\dfrac{15}{4}\)
\(=\dfrac{7}{6}\times\dfrac{9}{4}+\dfrac{15}{4}\)
\(=\dfrac{63}{24}+\dfrac{90}{24}=\dfrac{51}{8}\)
7/6 × 1/2 + 7/6 × 3/4 + 7/6 × 15/4
= 7/6 × (1/2 + 3/4 + 15/4)
= 7/4 × (2/4 + 3/4 + 15/4)
= 7/4 × 5
= 35/4
2x7 = 3x9
\(2x^7=3x^9\\ \Rightarrow\dfrac{x^7}{x^9}=\dfrac{3}{2}\\ \Leftrightarrow\dfrac{1}{x^2}=\dfrac{3}{2}\\ \Leftrightarrow3x^2=2\\ \Rightarrow x^2=\dfrac{2}{3}\\ \Rightarrow x=\pm\sqrt{\dfrac{2}{3}}\)
`2x^7 =3x^9`
`2x^7 -3x^9 =0`
`x^7 (2-3x^2)=0`
`=>x^7=0` hoặc `2-3x^2 =0`
`=>x=0` hoặc `3x^2 =2`
`=>x=0` hoặc \(x=\sqrt{\dfrac{2}{3}}\) hoặc \(x=-\sqrt{\dfrac{2}{3}}\)