Tính nhanh:
a} 125.98.2.8.25
b} 8466. 15+170.4233
c} 16{27+75} + 8{53+25} .2
tính nhanh nhé
7) 53(51+4)+53(49+96)+53
8)42(15+96)+6(25+4).7
9) 45(13+78)+9(87+22).5
10) 16(27+75)+8(53+25).2
7)
53.(51+4)+53.(49+96)+53
=53.55+53.145+53
=53.(55+145+1)
=53.201
=10653
8)
42.(15+96)+6.(25+4).7
=42.111+(6.7).29
=42.111+42.29
=42.(111+29)
=42.140
=5880
9)
45.(13+78)+9.(87+22).5
=45.91+(9.5).109
=45.91+45.109
=45.(91+109)
=45.200
=9000
10)
16.(27+75)+8.(53+25).2
=16.102+(8.2).78
=16.102+16.78
=16.(102+78)
=16.180
=2880
7)
53.(51+4)+53.(49+96)+53
=53.55+53.145+53
=53.(55+145+1)
=53.201
=10653
8)
42.(15+96)+6.(25+4).7
=42.111+(6.7).29
=42.111+42.29
=42.(111+29)
=42.140
=5880
9)
45.(13+78)+9.(87+22).5
=45.91+(9.5).109
=45.91+45.109
=45.(91+109)
=45.200
=9000
10)
16.(27+75)+8.(53+25).2
=16.102+(8.2).78
=16.102+16.78
=16.(102+78)
=16.180
=2880
tính nhanh
3) 14.35.5+10.25.7+20.7
4) 15(27+18+6)+ 15(23.12)
5) 24(15+49)+12(50+42)
6) 10(81+19)+100+50(91+9)
7) 53(51+4)+53(49+96)+53
8)42(15+96)+6(25+4).7
9) 45(13+78)+9(87+22).5
10) 16(27+75)+8(53+25).2
giúp mik nhé các bạn mong các bạn giúp đỡ
5) 24*(15+49)+12*(50+42)
=24*64+12*92
=24*64+12*2*46
=24*64+24*46
=24*(64+46)
=24*110
=2640
7) 53*( 51+4)+53*(49+96)+53
=53*55+53*145+53
=53*(55+145)+53
=53*200+53
10600+53
=10653
15*37*4+120*21+21*5*12
15*(27+18+6)+15*(23+12)
10*(81+19)+100+50*(91+9)
42*(15+96)+6*(25+4)*7
16*(27+75)+8*(53+25)*2
1 . Tính nhanh
a/ 15 . ( 27 + 18 + 6 ) + 15 . ( 23 + 12 )
b/ 14 . 35 . 5 + 10 . 25 .7 + 20 . 70
c/ 53 . ( 51 + 4 ) + 53 . ( 49 + 96 ) + 53
d/ 46 . ( 27 + 75 ) + 8 . ( 58 + 25 ) . 2
a) 15 . (27 + 18 + 6 ) + 15 . ( 23 +12 ) = 15. 51 + 15 . 35 = 765 + 525 = 1290
b) 14 . 35 . 5 + 10 . 25 . 7 + 20 . 70 = 2450 + 1750 + 1400 = 2452450
c) 53 . ( 51 + 4 ) + 53 . ( 49 + 96 ) + 53 = 53 . 55 + 53 . 145 + 53 = 2915 . 7685 = 22401775
d) 46 . ( 27 +75 ) +8 . ( 58 + 25 ) + 8 . ( 58 + 25 ) . 2 = 46 . 102 + 8 . 83 + 8 . 83 = 4692 + 664 + 664 = 6020
tính
a, 16.(27+75) +8 . (53+25):2
b, 53x ( 51+4) +53x (49+96) + 53
c,158+ 445 + 342+555
d, 125x98x2x8x25
e,7+10+13+16+19+22+25
dau cham la dau phay
1. Tính nhanh:
a) 32 + 89 + 68 b) 64 + 112 + 236 c) 1350 + 360 + 650 + 40
2. Tính nhanh:
a) 25 . 64 . 4 b) 25 . 5 . 4 . 2 c) 25 . 50 . 4 . 20
d) 32 . 47 + 32 . 53 e) 15 . 145 – 15 . 45 + 500
3. Tìm số tự nhiên x, biết:
a) 23 . (42 – x) = 23 b) 15 . (x – 3) = 30
4. Tìm số tự nhiên x, biết:
a) 119 – x = 97 c) (15 . x) : 60 = 3
b) x : 15 = 0 d) 241 + (107 – x) = 260
5. Tìm số tự nhiên x, biết:
a) x – 57 = 63 c) 7 . x : 28 = 5
b) 119 – x = 97 d) 1751 : x = 103
6. Bạn Bo cần mua tem loại 800 đồng với số tiền hiện có là 2500 đồng. Bạn Bo có thể mua tối đa bao nhiêu tem:
Bài 3:
a: Ta có: \(23\left(42-x\right)=23\)
\(\Leftrightarrow42-x=1\)
hay x=41
b: Ta có: 15(x-3)=30
nên x-3=2
hay x=5
Bài 1:
a: 32+89+68=100+89=189
b: 64+112+236=300+112=412
c: \(1350+360+650+40=2000+400=2400\)
Tính nhanh:
a) -5/9 - 4/15 + 2/9 -11/15
b -8/13 - 7/16 + 21/13 - 1/6
c -15/25 - 14/21 + 8/5 - 5/3
giúp mình v chiều về m đi học r
a) \(\dfrac{-5}{9}-\dfrac{4}{15}+\dfrac{2}{9}-\dfrac{11}{15}\)
\(=\left(\dfrac{-5}{9}+\dfrac{2}{9}\right)-\left(\dfrac{4}{15}+\dfrac{11}{15}\right)\)
\(=\dfrac{-3}{9}-\dfrac{15}{15}\)
\(=-\dfrac{1}{3}-1\)
\(=-\dfrac{4}{3}\)
b) \(\dfrac{-8}{13}-\dfrac{7}{16}+\dfrac{21}{13}-\dfrac{1}{6}\)
\(=\left(\dfrac{-8}{13}+\dfrac{21}{13}\right)-\dfrac{7}{16}-\dfrac{1}{6}\)
\(=\dfrac{13}{13}-\dfrac{29}{48}\)
\(=1-\dfrac{29}{48}\)
\(=\dfrac{19}{48}\)
c) \(\dfrac{-15}{25}-\dfrac{14}{21}+\dfrac{8}{5}-\dfrac{5}{3}\)
\(=\dfrac{-3}{5}-\dfrac{2}{3}+\dfrac{8}{5}-\dfrac{5}{3}\)
\(=\left(\dfrac{-3}{5}+\dfrac{8}{5}\right)-\left(\dfrac{2}{3}+\dfrac{5}{3}\right)\)
\(=\dfrac{5}{5}-\dfrac{7}{3}\)
\(=1-\dfrac{7}{3}\)
\(=-\dfrac{4}{3}\)
a: =-5/9+2/9-11/15-4/15
=-3/9-1
=-12/9=-4/3
b: =-8/13+21/13-7/16-1/6
=1-1/6-7/16
=5/6-7/16
=19/48
c: =-15/25+8/5-2/3-5/3
=-7/3+1
=-4/3
a) \(-\dfrac{5}{9}-\dfrac{4}{15}+\dfrac{2}{9}-\dfrac{11}{15}\)
\(=\left(-\dfrac{5}{9}+\dfrac{2}{9}\right)+\left(-\dfrac{4}{15}-\dfrac{11}{15}\right)\)
\(=-\dfrac{1}{3}-1=-\dfrac{4}{3}\)
b) \(-\dfrac{8}{13}-\dfrac{7}{16}+\dfrac{21}{13}-\dfrac{1}{16}\)(sửa đề)
\(=\left(-\dfrac{8}{13}+\dfrac{21}{13}\right)+\left(-\dfrac{7}{16}-\dfrac{1}{16}\right)\)
\(=1-\dfrac{1}{2}=\dfrac{1}{2}\)
c) \(-\dfrac{15}{25}-\dfrac{14}{21}+\dfrac{8}{5}-\dfrac{5}{3}\)
\(=-\dfrac{3}{5}-\dfrac{2}{3}+\dfrac{8}{5}-\dfrac{5}{3}\)
\(=\left(-\dfrac{3}{5}+\dfrac{8}{5}\right)-\left(\dfrac{2}{3}+\dfrac{5}{3}\right)\)
\(=1-\dfrac{7}{3}=\dfrac{-4}{3}\)
tính
a, 16.(27+15)+8.(53+25):2
b, 53.(51+4)+53.53.(49+96)+53
c,158+445+555
d,125.98.2.8.25
e,7+10+13+16+19+22+25
a, 16.(27+15)+8.(53+25):2
= 4.[(27+15).4] + 4.(53+25)
= 4.168 + 4.312
= 4.(168+312)
= 4.480=1920.
...
Câu b tình bt thui!
b, 53.(51+4)+53.53.(49+96)+53
=53.55+53.53.145+53
=2915+407305+53
=410220+53=410273
d,125.98.2.8.25
= 25.2.2.98.2.2.2.2.25.
= [(25.2.2.2)+(25.2.2.2)].98.
= (200 + 200).98.
= 400 . 98 = 39200.
a)15×17-15/15×16+10
b)23×29-10/23×28+13
c)75×8+25/75×82-50
d)53+153×156/153×157-100
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