158+445+342+555
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
a. 547 + 389 + 453 + 211
b. 158 + 445 + 342 + 555
c. 24 x 3 x 5 x 10
d. 12 x 5 x 15 x 7
e. 1122 x 34 + 2244 x 83
f. 8466 x 15 + 170 x 4233
a) \(547+389+453+211\)
\(=\left(547+453\right)+\left(389+211\right)\)
\(=1000+600\)
\(=1600\)
b) \(158+445+342+555\)
\(=\left(158+342\right)+\left(445+555\right)\)
\(=500+1000\)
\(=1500\)
c) \(24.3.5.10\)
\(=\left(24.5\right).\left(10.3\right)\)
\(=120.30\)
\(=3600\)
d) \(12.5.15.7\)
\(=\left(12.5\right).\left(15.7\right)\)
\(=60.105\)
\(=6300\)
e) \(1122.34+2244.83\)
\(=1122.2.17+2244.83\)
\(=2244.17+2244.83\)
\(=2244.\left(17+83\right)\)
\(=2244.100\)
\(=224400\)
f) \(8466.15+170.4233\)
\(=8466.15+85.2.4233\)
\(=8466.15+85.8466\)
\(=8466.\left(15+85\right)\)
\(=8466.100\)
\(=846600\)
A 1600
B 1500
C 3600
D 6300
\(a,547+389+453+211\)
\(=\left(547+453\right)+\left(389+211\right)\)
\(=1000+600\)
\(=1600\)
\(b,158+445+342+555\)
\(=\left(158+342\right)+\left(445+555\right)\)
\(=500+1000\)
\(=1500\)
\(c,24\times3\times5\times10\)
\(=\left(24\times5\right)\times\left(3\times10\right)\)
\(=120\times30\)
\(=3600\)
\(d,12\times5\times15\times7\)
\(=60\times105\)
\(=6300\)
\(e,1122\times34+2244\times83\)
\(=1122\times2\times17+2244\times83\)
\(=2244\times\left(17+83\right)\)
\(=2244\times100\)
\(=224400\)
\(f,8466\times15+170\times4233\)
\(=8466\times15+85\times2\times4233\)
\(=8466\times\left(15+85\right)\)
\(=8466\times100\)
\(=846600\)
Học tốt
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.
111234=?
555+445=?
111234=111234
555+445=1000
chúc bạn học tốt
em nhóm (445+555) + (800+200)+(680+320)
= 1000 + 1000 + 1000
= 3000 nha em;chúc em hok tốt nha
Tính:
627 - 443 746 - 251 516 - 342 935 - 551 555 - 160
627 - 443 184 746 - 251 495 516 - 342 174 935 - 551 384 555 - 160 395
tinh bang hai cach
a( 342 + 158 ) * 14
b(726 +426 ) * 15
c1 a ( 342 + 158 ) * 14=500*14=7000
c2 a ( 342 + 158 ) * 14=342*14+158*14=4788+2212=7000
c1 b ( 726 + 426 ) * 15=1152*15=17280
c2 b ( 726 + 426 ) * 15=726*15+426*15=10890+6390=17280
Nhớ k mk nha!^^ rất cảm ơn!
Tính hợp lí
a) 762 - (325 - 138) + 125
b) -56.731 - 56.70 + 56
c)- (671 - 563) + (-462 - 129 -122)
d) -342 - (3485 + 234 + 158) - (-3485)
a: =762-325+138+125
=900-200=700
b; =-56(731+70-1)=-56*800=-44800
c: =-671+563-462-129-122
=-1384+563
-821
d: =-342-3485-234-158+3485
=-734
1_tìm x
a,357+143-(x+280)=200
b,445+x:5=500
c,555-x+600=1100
Các bạn nhớ giải hẳn ra công thức nhé