TÍNH:
12x2:2 34-6+8 98-78x6
28x7-8 67-9+90 23x3-6
1/ tính
a) (37-17).(-5)+23.(-13-17)
b) (-57).(67-34)-67.(34-57)
2/ tính nhanh
a) (-4).(+125).(-25).(-6).(-8)
b) (-98).(1-246)-246.98
Tính :
a) (37-17).(-5)+23.(-13-17)
b) (-57).(67-34)-67.(34-57)
tính nhanh :
a) (-4).(+125).(-25).(-6).(-8)
b) (-98).(1-246)-246.98
Số?
a) 34+99= ?+34 (24+8)+12=24+(8+?)
13+297=297+? 6+4+8=(6+?)+8
201+118=?+201 98+63+37=98+(63+?)
b)
9+?=9
61+?=61
?+0=87
?+10=10
a) 34 + 99 = 99 + 34 13 + 297 = 297 + 13 201 + 118 = 118 + 201 b) 9 + 0 = 9 61 + 0 = 61 |
(24 + 8) + 12 = 24 + (8 + 12) 8 + 6 + 4 = 8 + (6 + 4) 63 + 37 + 98 = (63 + 37) + 98
87 + 0 = 87 0 + 10 = 10 |
1. x - 8 +32= 68
2. x +8+32=68
3. 98-x +34=43
4. 98+x-34=43
5. x :5:4=800
6. 18+x=384:8
7. (84,6-2 x x):3,02= 5,1
8. x x5= 120:6
9. (15x 24-x) :0,25= 100:0,25
1. \(x-8+32=68\)
\(x-8=68-32\)
\(x-8=36\)
\(x=36+8\)
\(x=44\)
_____
2. \(x+8+32=68\)
\(x+8=68-32\)
\(x+8=36\)
\(x=36-8\)
\(x=28\)
_____
3. \(98-x+34=43\)
\(98-x=43-34\)
\(98-x=9\)
\(x=98-9\)
\(x=89\)
_____
4. \(98+x-34=43\)
\(98+x=43+34\)
\(98+x=77\)
\(x=77-98\)
\(x=-21\)
_____
5. \(x:5:4=800\)
\(x:5=800.4\)
\(x:5=3200\)
\(x=3200.5\)
\(x=16000\)
_____
6. \(18+x=384:8\)
\(18+x=48\)
\(x=48-18\)
\(x=30\)
_____
7. \(\left(84,6-2\times x\right):3,02=5,1\)
\(84,6-2.x=5,1.3,02\)
\(84,6-2.x=15,402\)
\(2.x=84,6-15,402\)
\(2.x=69,198\)
\(x=69,198:2\)
\(x=34,599\)
_____
8. \(x\times5=120:6\)
\(x.5=20\)
\(x=20:5\)
\(x=4\)
_____
9. \(\left(15\times24-x\right):0,25=100:0,25\)
\(\left(15.24-x\right):0,25=400\)
\(15.24-x=400.0,25\)
\(15.24-x=100\)
\(360-x=100\)
\(x=360-100\)
\(x=260\)
1,x-8+32=68
=>x-8=68-32=36
=>x=36+8=42
2,x+8+32=68
=>x+8=68-32=36
=>x=36-8=28
3,98-x+34=43
=>98-x=43-34=9
=>x=98-9=89
4,98+x-34=43
=>98+x=43+34=77
=>x=77-98=-21
5,x:5:4=800
=>x:20=800
=>x=800x20=16000
6,18+x=384:8=48
=>x=48-18=30
7,(84,6-2x):3,02=5,1
=>84,6-2x=5,1x3,02=15,402
=>2x=84,6-15,402=69,198
=>x=69,198:2=34,599
8,5x=120:6=20
=>x=20:5=4
9,(15x24-x):0,25=100:0,25=400
=>360-x=400x0,25=100
=>x=360-100=260.
1. \(...\Rightarrow x+24=68\Rightarrow x=68-24=44\)
2. \(...\Rightarrow x+40=68\Rightarrow x=68-40=28\)
3. \(...\Rightarrow3^{2\left(8+x\right)}=9=3^2\Rightarrow2\left(8+x\right)=2\Rightarrow8+x=1\Rightarrow x=-7\)
4. \(...\Rightarrow3^{2\left(8+x\right)}=77\) (bạn xem lại đề)
5. \(...\Rightarrow x:5=800.4\Rightarrow x:5=3200\Rightarrow x=3200.5=16000\)
6. \(...\Rightarrow18+x=48\Rightarrow x=48-18=30\)
7. \(...\Rightarrow84,6-2x=5,1.3,02=15,402\Rightarrow2x=84,6-15,402\Rightarrow2x=69,198\Rightarrow x=34,599\)
8. \(...\Rightarrow5.x=20\Rightarrow x=20:5=4\)
9. \(\left(360-x\right):0,25=400\Rightarrow360-x=400.0,25=100\Rightarrow x=400-100=300\)
1. Tính: 15/8 - 4/9 x 6/8 + 1/6.
2. Tính = cách thuận tiện NHẤT:
A) 739 x 2 + 739 + 739 x 3 + 739 x 4.
B) 801 x 67 + 34 x 801 - 801.
1.\(\dfrac{11}{8}\)
2.A)739\(\times\) (2+1+3+4)=7390
B)801\(\times\) (67+34-1)=80100
Tính nhẩm:
a) 66 - 60 = 98 - 90 = 72 - 70 =
78 - 50 = 59 - 30 = 43 - 20 =
b) 58 - 4 = 67 - 7 = 99 - 1 =
58 - 8 = 67 - 5 = 99 - 9 =
a) 66 - 60 = 6 98 - 90 = 8 72 - 70 = 2
78 - 50 = 28 59 - 30 = 29 43 - 20 = 23
b) 58 - 4 = 54 67 - 7 = 60 99 - 1 = 98
58 - 8 = 50 67 - 5 = 62 99 - 9 = 90
a) 66 - 60 = 6 98 - 90 = 8 72 - 70 = 2
78 - 50 = 28 59 - 30 = 29 43 - 20 = 23
b) 58 - 4 = 54 67 - 7 = 60 99 - 1 = 98
58 - 8 = 50 67 - 5 = 62 99 - 9 = 90
3.tính
(37-17).(-5)+23.(-13-17)
(-57).(67-34)-67.(34-57)
4. Tính nhanh
(-4).(+125).(-25).(-6).(-8)
(-98).(1-246)-246.98
1)Tính :
a)(37-17).(-5)+23.(-13-17)
b)(-57).(67-34)-67.(34-57)
2)Tính nhanh :
a)(-4).(+125).(-25).(-6).(-8)
b)(-98).(1-246)-246.98
Ai làm nhanh, đúng, chi tiết mình tick cho !
bài 1
ý a là -560
ý b là -340
bài 2
ý a là 600000
ý b là -98
tich nha bạn
a)= 20.(-5)+23.(-20)=-20.5+23.(-20)=-20.(5+23)=-20.28=-560
a) = 20 . (-5) + 23 . ( -30)
= -100 + - 690
= - 790
1+6+7+9+3+5+67+78+23 +87+98+34+34=bao nhiêu
1+6+7+9+3+5+67+78+23 +87+98+34+34
= 7 + 7+ 9 + 3 + 5 + 67 + 78 + 23 + 87+ 98 + 34 + 34
= 14 + 9 + 3 + 5 + 67 + 78 + 23 + 87+ 98 + 34 + 34
= 23 + 3 + 5 + 67 + 78 + 23 + 87+ 98 + 34 + 34
= 26 + 5 + 67 + 78 + 23 + 87+ 98 + 34 + 34
= 31 + 67 + 78 + 23 + 87+ 98 + 34 + 34
= 98 + 78 + 23 + 87+ 98 + 34 + 34
= 176 + 23 + 87+ 98 + 34 + 34
= 199 + 87+ 98 + 34 + 34
= 286 + 98 + 34 + 34
= 452
mình tính bằng 452
bạn k mình nha
1+6+7+9+3+5+67+78+23+87+98+34+34=452