9-6:3.2=?
(-14)+(-350)+(-16)+350=?
8.26+8.74-800=?
3-5^4: 5^3 + 3^3=?
Tính nhanh:
a. 3 x 5 + 2 x 3 + 3 x 3
b. 2 x 9 + 5 x 9 + 27
c. 5 x 8 - 16 + 8 x 6
d. (650 - 298 + 350) x (70 : 14 x 2 - 10)
a. 3.(5+2+3)=30
b. 9.(2+5+3)=90
c. 8.(5-2+6)=72
d. (1000-298).(140:14-10)=702.0=0
a. 3x5 + 2x3 +3x3
= 3x(5+2+3)
=3x10=30
b.2x9 + 5x9 +27
= 2x9 +5x9 +3x9
=9x(2+5+3)
=9x10=90
c.5x8 -16 + 8x6
=5x8 -2x8 + 8x6
=8x(5-2+6)=8x10=80
d.(650-298+350)x(70:14x2 - 10)
=(650-296=350)x(5x2 - 10)
=0
bài 1 tính
a) (3/7+-9/8)+(5/8+-6/14)
b) (-5/7+3/11)+(-11/14+14/-11)
c)(-4/5+2/3)+(-5/4+19/5)+(7/3.2)
d)9/16.13/4-9/4.5/16+9/16.17/4
1) 80 - ( 4.52 - 3.23 )
2) 23.75 + 23.25 + 180
3) ( 71997 - 71995) : (7.71994)
4) -37 +54 + (-70) + (-163) +246
5) 217 + [ 43 + (-127) + (-23)]
6) 2448 : [119 - (23 - 6)]
7) 397 . 143 + 397 .856 +397
8) (28 + 27 + 26 + 25) : (32 . 15)
9) (-359) + 181 +(-123) +350 + (-172)
10) (-1) + (-2) + (-3) + (-4) + (-5) + (-6) + (-7) + (-8) + (-9) + (-10) + (-11) + (-12) + (-13) + (-14) + (-15) + (-16) + (-17) + (-18) + (-19)
rut gon 1*2*5+3*3*15+4*8*20+7*14*350/2*5*11+6*10+33+8*20*44+14*35*770
11 tính nhanh
a. -37 + 54 + -70+ -163 + 246
b. -359+ 181+ -123+ 350+ -172
c.-69+ 53+ 46+ -94+-14+ 78
d. 13- 12+ 11+10- 9+ 8- 7- 6+ 5- 4+ 3+2- 1
a. -37 + 54 + -70+ -163 + 246
= ( 54 + 246) + (-37 - 163 ) - 70
= 300 -200 - 70 = 30
b. -359+ 181+ -123+ 350+ -172
=(-178)+227+(-172)
=49+(-172)
=-123
c.-69+ 53+ 46+ -94+-14+ 78
=(-16)+(-48)+64
=-64+64
=0
d. 13- 12+ 11+10- 9+ 8- 7- 6+ 5- 4+ 3+2- 1
= 13 - (13 - 1) + (13 - 2) + (13 - 3) - (13 - 4) + (13 - 5) - (13 - 6) - (13 - 7) + (13 - 8) - (13 - 9) + (13 - 10) + (13 - 11) - (13 - 12)
= 13 - 13 + 1 + 13 - 2 + 13 - 3 - 13 + 4 + 13 - 5 - 13 + 6 - 13 + 7 + 13 - 8 - 13 + 9 + 13 - 10 + 13 - 11 - 13 + 12
= (13 - 13 + 13 + 13 - 13 + 13 - 13 - 13 + 13 - 13 + 13 + 13 - 13) + (1 - 2 - 3 + 4 - 5 + 6 + 7 - 8 + 9 - 10 - 11 = 12)
= 13 + 0
= 13
a) \(-37+54+\left(-70\right)+\left(-163\right)+246\)
\(=\left(246+54\right)-\left(37+163\right)-70\)
\(=300-200-70\)
\(=100-70=30\)
b) \(-359+181+\left(-123\right)+350+\left(-172\right)\)
\(=-359+181-123+350-172\)
\(=\left(-359+350\right)+\left(181-172\right)-123\)
\(=-9+9-123\)
\(=-123\)
c) \(-69+53+46+\left(-94\right)+\left(-14\right)+78\)
\(=-69+53+46-94-14+78\)
\(=\left(-69+78\right)+\left(53-14\right)+\left(46-94\right)\)
\(=9+39-48\)
\(=48-48=0\)
d) \(13-12+11+10-9+8-7-6+5-4+3+2-1\)
\(=\left(13-12\right)+\left(11+10\right)-\left(9-8\right)-\left(7+6\right)+\left(5-4\right)+\left(3+2-1\right)\)
\(=1+21-1-13+1+5\)
\(=21-13+1+5\)
\(=8+1+5=9+5=14\)
Tính nhanh:
a) -37 +54 +(- 70)+(- 163)+246
b)-359 +181+(-123)+350+(-172)
c)-69 +53 + 46 +(- 94)+(- 14) + 78
d)13 -12 +11 +10 -9 + 8 -7 -6 +5 - 4 +3 +2 -1
a: =17-70-163+246
=-43-163+246
=246-206
=40
1 . 4(x+41)=400
2. 11(x-9)=77
3. 5(x-9)=350
4. 2x-49=3.32
5. 200-(2x+6)=43
1. 4(x+41)=400
<=>x+41=100
<=>x=59
2.11(x-9)=77
<=>x-9=7
<=>x=16
3.5(x-9)=350
<=>x-9=70
<=>x=79
4.2x-49=3.32
<=>2x=3.32+49
<=>2x=76
<=>x=38
5.200-(2x+6)=43
<=>200-2x-6=64
<=>-2x=64-200+6
<=>-2x=-130
<=>x=65
1) 4(x+41)=400
x+41=400:4
x+41=100
x=100-41
x=59
2) 11(x-9)=77
x-9=77:11
x-9=7
x=7+9
x=16
3) 5(x-9)=350
x-9=350:5
x-9=70
x=70+9
x=79
4) 2x-49=3.3\(^2\)
2x-49=3\(^3\)
2x-49=27
2x=27+49
2x=76
x=76:2
x=38
5, 200-(2x+6)=4\(^3\)
200-(2x+6)=64
2x+6=200-64
2x+6=136
2x=136-6
2x=130
x=130:2
x=65
đúng nha
thanks bn nhìu
Thực hiện phép tính :
a. ( -3 ) + 8 - 11
b. 7 - ( -9 ) -3
c. ( -5 ) - ( 9-12 )
d. ( -9 ) + ( -1 ) - ( -2 )
e. ( -3 ) + ( -350 ) + ( -6 )
a: (-3)+8-11
\(=\left(-3-11\right)+8\)
=-14+8
=-6
b: \(7-\left(-9\right)-3\)
=7+9-3
=16-3
=13
c: \(\left(-5\right)-\left(9-12\right)\)
\(=\left(-5\right)-\left(-3\right)\)
=-5+3
=-2
d: \(\left(-9\right)+\left(-1\right)-\left(-2\right)\)
\(=\left(-9-1\right)+2\)
=-10+2
=-8
e: \(\left(-3\right)+\left(-350\right)+\left(-6\right)\)
\(=-\left(3+350+6\right)\)
=-359
a. (-3) + 8 - 11
= 5 - 11
= -6
b. 7 - (-9) - 3
= 16 - 3
= 13
c. (-5) - (9 - 12)
= -5 - (-3)
= -2
d. (-9) + (-1) - (-2)
= -10 + 2
= -8
e. (-3) + (-350) + (-6)
= [(-3) + (-6)] + (-350)
= -9 - 350
= -359
a) (-3)+8-11
=(−3−11)+8=(−3−11)+8
=-14+8
=-6
b) 7−(−9)−37−(−9)−3
=7+9-3
=16-3
=13
c) (−5)−(9−12)(−5)−(9−12)
=(−5)−(−3)=(−5)−(−3)
=-5+3
=-2
d) (−9)+(−1)−(−2)(−9)+(−1)−(−2)
=(−9−1)+2=(−9−1)+2
=-10+2
=-8
e) (−3)+(−350)+(−6)(−3)+(−350)+(−6)
=−(3+350+6)=−(3+350+6)
=-359
thêm dấu để tạo thành phép tính đúng
1 2 3 4 5 6 7 8 9=350
theo mk là dấu x
thấy mk đúng thì tk nha