a) 43 (53 - 81) + 53 (81 - 43) b) 4. (-5)2 + 2.(-5) - 20
c) 27. (15 - 12) - 15. (27 - 12) d) 53 + (-51) + (-53) + 49
giải cho mik với, mik đang cần gấp, ai đúng mik tick cho
Thực hiện phép tính
a, 53 . ( - 15). + ( - 15 ) . 47
b, 43 . ( 53 - 81) + 53 . ( 81 - 43 )
c, ( - 5 ) . 8 + ( - 2) . 3
d, 3 . ( - 4)2 + 2 . ( - 5) - 20
a, 53.(-15)+(-15).47
=(-15)(53+47)
=(-15).100
=-1500
b, 43.(53-81)+53.(81-43)
=43.(-28)+53.38
=810
c,(-5).8+53.(81-43)
=-45+53.38
=1969
d, ban tu giai nốt
a,-15 . (53+47)
= -15 . 100
=-1500
b,43.53-43.81+53.81-43.53
=(43.53-43.53)+81.(-43+53)
= 0 + 81.10
=0+810
=810
c,-40+-8
=-48
d,3.16+(-10)-20
=48+(-10)-20
=38-20
=18
a) 53 . (-15) + (-15) . 47
= (53 + 47) . (-15)
= 100 . (-15)
= -1500
b) 43 . (53 - 81) + 53 . (81 - 43)
= 43 . (-28) + 53 . 38
= -1204 + 2014
= 810
c) (-5) . 8 + (-2) . 3
= (-5) . (-2) . (-4) + (-2) . 3
= 20 . (-2) + (-2) . 3
= (20 + 3) . (-2)
= -46
d) 3 . (-4)2 + 2 . (-5) - 20
= 3.16 + (-10) - 20
= 18
k cho tớ nha bn
Câu 1.Thực hiện phép tính (bằng cách hợp lí nếu có thể)
a) 53.(-15) + (-15).47
b) 43 (53 – 81) + 53 (81 – 43)
Câu 2:Liệt kê rồi tính tổng các số nguyên x thỏa mãn :
- 20 < x < 20
Câu 3. Tìm số nguyên x biết:
a) – 2x – 8 = 72
b)|x-2|= 27
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
bài 1: tính nhanh
14.35.5+10.25.7+20.70
15.(27+18+6) + 15.(23+12)
24.15+49) + 12.(50+42 )
10.(81+19) + 100 + 50 .(91+9)
53.(51 +4) +53 .( 49+96) 53
nói chung là lên gg mà sợt;vvv
a) 324 + [112- (112 + 324 ) - 230]
b) 53 . ( -15 ) + ( - 15 ) . 47
c) 43 . ( 53 - 81 ) + 53. ( 81 - 43 )
d) (192 - 37 + 85) - ( 85 + 192 )
Giải hộ mik vs ạ
tính thường hay tính nhanh vậy bạn?
Nguyễn Hoàng Thiên Di
tính thường cx đc mà tính nhanh càng tốt nha
đợi mik xíu vì giải hơi dài ạ
Bài 3: Tính bằng cách hợp lí
a, 75- 5( 15-40 ) - (-60)
b, 35-7.(5-18)
c, 42.67+ 33. (4) 2
d, 43. ( 53-81 ) + 53 .(81-43) - 31
Ai làm nhanh nick nạk
a,=75-5*15-5*40+60
=75-75-60+60
=0+0
=0
b,=35-7*5-7*18
=35-35-126
=0-126
=-126
c,(cau c hinh nhu sai de)
d,=43*53-43*81+53*81-53*43-31
=(43*53-53*43)+81*(-43+53)-31
=0+81*10-31
=810-31
=779
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 hợp lí
a, 15.(27+ 18 +6 ) + 15.( 23 +12)
b, 24.(15 + 49 ) + 12. ( 50 + 42 )
c, 53.(51+4)+53.(49+96) +53
d, 42.( 15 +96) +6.(25 +4).7
Tính hợp lí
a,15.(27+ 18 +6 ) + 15.( 23 +12)
= 15(27+18+6+23+12)
= 15.86
= 1290
b,24.(15 + 49 ) + 12. ( 50 + 42 )
=12.2(15+49)+12.(50+42)
= 12(30+98)+12(50+42)
=12(30+98+50+42)
=12.220
= 2640
c,53.(51+4)+53.(49+96) +53
=53(51+4)+53(49+96)+53.1
=53(51+4+49+96+1)
=53.201
=10653
d,42.( 15 +96) +6.(25 +4).7
=42(15+96)+42(25+4)
=42(15+96+25+4)
=42.140
=5880
tick đúng cho mk nha pikachu
Tính hợp lí:
\(a)\)\(15.\left(27+18+6\right)+15.\left(23+12\right)\)
\(=\)\(15.51+15.35\)
\(=\)\(15.\left(51+35\right)\)
\(=\)\(15.86\)
\(=\)\(1290\)
\(b)\)\(24.\left(15+49\right)+12.\left(50+42\right)\)
\(=\)\(24.64+12.92\)
\(=\)\(1536+1104\)
\(=\)\(2640\)
\(c)\)\(53.\left(51+4\right)+53.\left(49+96\right)+53\)
\(=\)\(53.55+53.145+53\)
\(=\)\(53.\left(145+55+1\right)\)
\(=\)\(53.201\)
\(=\)\(10653\)
\(d)\)\(42.\left(15+96\right)+6.\left(25+4\right).7\)
\(=\)\(42.\left(15+96\right)+42.\left(25+4\right)\)
\(=\)\(42.111+42.29\)
\(=\)\(42.140\)
\(=\)\(5880\)
Tính một cách hợp lí
a) 13.58.4+32.26.2+52.10
b)14.35.5+10.25.7+20.70
C) 15.(27+18+6)+15.(23+12)
d) 53.(51+4)+53.(49+96)+53
e)15.37.4+120.21+21.5.12
a) \(\text{13 x 58 x 4 + 32 x 26 x 2 + 52 x 10 }\)
\(\text{=(13 x 4 ) x 58 + 32 x 13 x 2 x 2 + 13 x 4 x 10}\)
\(\text{= ( 13 x 4 ) x 58 + 32 x ( 13 x 2 x 2 ) + ( 13 x 4 ) x 10 }\)
\(\text{= 52 x 58 + 32 x 52 + 52 x 10}\)
\(\text{=52 x ( 58 + 32 + 10 )}\)
\(\text{=52 x 100 = 5200}\)
b) \(\text{14 x 35 x 5 + 10 x 25 x 7 + 20 x 70 x 2}\)
\(\text{= ( 14 x 5 ) x 35 + (10 x 7 ) x 25 + 20 x 70 x 2 }\)
\(\text{= 70 x 35 + 70 x 25 + 20 x 2 x 70 }\)
\(\text{= 70 x ( 35 + 25 + 40 )}\)
\(\text{= 70 x 100 = 7000 }\)
e) \(\text{5.3.37.4+5.24.21+21.5.12}\)
\(\text{= 5.(3.37.4+24.21+21.12)}\)
\(\text{= 5.1200}\)
\(=6000\)
a) \(13.58.4+32.26.2+52.10\)
\(=52.58+32.52+52.10\)
\(=52.\left(58+32+10\right)\)
\(=52.100=5200\)
b) \(14.35.5+10.25.7+20.70\)
\(=7.5.35.2+10.7.25+20.70\)
\(=35.70+70.25+20.70\)
\(=70\left(35+25+20\right)\)
\(=70.80=5600\)
c) \(...=15\left(27+18+6+23+12\right)\)
\(=15\left(27+23+18+12+6\right)\)
\(=15\left(50+30+6\right)=15.86=1290\)
d) \(...=53\left(51+4+49+96+1\right)\)
\(=53\left(51+49+4+96+1\right)\)
\(=53\left(100+100+1\right)=53.201=10653\)
e) \(15.37.4+120.21+21.5.12\)
\(=15.4.37+60.2.21+21.60\)
\(=60.37+60.42+21.60\)
\(=60.\left(37+42+21\right)=60.100=6000\)