21/47+9/45+26/47+36/45-1,5=
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Tính nhanh
a)(9/12-2x18):(3 4/5+0,2)
b)21/47+9/45+26/47+4/5
Tính hợp lí: \(\dfrac{21}{47}+\dfrac{9}{45}+\dfrac{26}{47}+\dfrac{4}{5}\)
\(\dfrac{21}{47}+\dfrac{9}{45}+\dfrac{26}{47}+\dfrac{4}{5}\)
\(=\left(\dfrac{21}{47}+\dfrac{26}{47}\right)+\left(\dfrac{9}{45}+\dfrac{4}{5}\right)\)
\(=1+1\)
\(=2\)
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Tính
a,21. 35 - 3 . 26 . 7
b, 77 - 11 . ( 30 + 7)
c, 85. ( 36 - 27 ) - 35 . ( 86 - 27 )
d, 47 . ( 43 - 15 ) - 47 . ( 45 + 15)
a,21.35-3.26.7
=735-546
=189
b,77-11.(30+7)
=77-407
=-330
c,85.(36-27)-35.(86-27)
=85.9-35.59
=765-2065
=1300
d,47.(43-15)-47.(45+15)
=47.28-47.60
=47.(28-60)
=47.(-32)=-1504
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Tính nhanh nếu có thể a. 5,3+(-0,7)-|-5,3| b. 5,3 -|-10| +|-3,1|-(-4,7) c.|-9|+|3,6| -|-4,1|+|1,3| d. 21/47+|-9/45|+|-26/47|+4/5 e. 3/8×58/3 -3/8×33×1/3
a: =5,3-0,7-5,3=-0,7
b: =5,3-10+3,1+4,7
=10-10+3,1=3,1
c: =9+3,6-4,1+1,3
=9+0,8=9,8
d: =21/47+26/47+1/5+4/5
=1+1
=2
e: =3/8(58/3-33/3)
=3/8*25/3
=25/8
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2. thực hiện phép tính
a. \(\dfrac{2}{5}-\dfrac{3}{7}+\dfrac{9}{45}\)
b\(\dfrac{5}{15}+\dfrac{14}{25}-\dfrac{12}{9}+\dfrac{2}{7}+\dfrac{11}{25}\)
c.\(\dfrac{21}{47}+\dfrac{9}{45}+\dfrac{26}{47}+\dfrac{45}{5}\)
a)\(\dfrac{2}{5}-\dfrac{3}{7}+\dfrac{9}{45}\\ =\dfrac{2}{5}-\dfrac{3}{7}+\dfrac{1}{5}\\ =\dfrac{14-15+1}{35}\\ =\dfrac{0}{35}=0\)
b)\(\dfrac{5}{15}+\dfrac{14}{25}-\dfrac{12}{9}+\dfrac{2}{7}+\dfrac{11}{25}\\ =\left(\dfrac{1}{3}-\dfrac{4}{3}\right)+\left(\dfrac{14}{25}+\dfrac{11}{25}\right)+\dfrac{2}{7}\\ =-1+1+\dfrac{2}{7}\\ =0+\dfrac{2}{7}=\dfrac{2}{7}\)
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a) 21/47 + 9/45 +26/47 + 4/5 (21/47 + 26/47) + (9/45 + 4/5)1+1 2b) 15/12 + 5/13 - 3/12 - 18/13 (15/12 - 3/12) + (18/13 - 5/13)1+1 2c) 13/25 + 6/41 - 38/25 + 35/41 - 1/2 (38/25 - 13/25) + (35/41 + 6/41) + 1/2 1+1 + 1/2 5/2d) 27/23 + 5/21 - 4/23 + 6/21 + 1/2 (27/23 - 4/23) + (6/21 - 5/21) + 1/2 ..........................Đúng không? Phần sau mình tính sao ra kết quả lạ lắm, tính giúp mình.
Đọc tiếp
a) 21/47 + 9/45 +26/47 + 4/5
= (21/47 + 26/47) + (9/45 + 4/5)
=1+1 = 2
b) 15/12 + 5/13 - 3/12 - 18/13
= (15/12 - 3/12) + (18/13 - 5/13)
=1+1 = 2
c) 13/25 + 6/41 - 38/25 + 35/41 - 1/2
= (38/25 - 13/25) + (35/41 + 6/41) + 1/2
= 1+1 + 1/2 = 5/2
d) 27/23 + 5/21 - 4/23 + 6/21 + 1/2
= (27/23 - 4/23) + (6/21 - 5/21) + 1/2
= ..........................
Đúng không? Phần sau mình tính sao ra kết quả lạ lắm, tính giúp mình.
(-3/4+2/3):5/11+(-1/4+1/3):5/11
a)|x-13|-35-45=-47
b)(4+x).(x+3)=0
c)25-(5-x)=120-(28-5)
Tính
a) (-37-17) . (-9) + 35 . (-9-11)
b) ( -25) . (75-45) - 75 . ( 45-25)
c) 136 . ( -47) + 36 . 47
d) (-48) . 72 + 36 . (-304)
\(a,\left(-37-17\right).\left(-9\right)+35.\left(-9-11\right)\)
\(=\left(-54\right).\left(-9\right)+35.\left(-20\right)\)
\(=486+\left(-700\right)\)
\(=-214\)
\(b,\left(-25\right).\left(75-25\right)-75.\left(45-25\right)\)
\(=\left(-25\right).50-75.20\)
\(=\left(-25\right).50+\left(-25\right).3.20\)
\(=\left(-25\right).50+\left(-25\right).60\)
\(=\left(-25\right).\left(50+60\right)\)
\(=\left(-25\right).110\)
\(=-2750\)
\(c,136.\left(-47\right)+36.47\)
\(=47.\left(-136+36\right)\)
\(=47.\left(-100\right)\)
\(=-4700\)
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1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50=?
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50=1275
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1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50.
Có ai rảnh đâu mà đi ngồi cộng ngần đấy số ra.
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