ting mot cach hop li:
(44x52x60) : ( 11x13x15)
(44x52x60):(11x13x15)
\(\dfrac{44\cdot52\cdot60}{11\cdot13\cdot15}=\dfrac{4\cdot11\cdot4\cdot13\cdot4\cdot15}{11\cdot13\cdot15}=4^3=64\)
(44x52x60):(11x13x15)
= ( 44 : 11) x ( 52 : 13 ) x ( 60 : 15 )
= 4 x 4 x 4
= 64
Nếu có gì sao, sửa hộ mình nha!☺❤
tinh mot cach hop li:
1234.2014+2014.8766
1234.2014+2014.8766
=2014.(1234+8766)=2014.10000=20140000
\(1234.2014+2014.8766\)
\(=2014.\left(1234+8766\right)\)
\(=2014.10000\)
\(=20140000\)
1234.2014+2014.8766
=2014.(1234+8766)
=2014.10000
=20140000
tinh mot cach hop li
341.67+341.16+659.83
341.67+341.16+659.83
=341.(67+16)+659.83
=341.83+659.83
=83.(341+659)
=83.1000
=83000
=341(67+16)+659.83=341.83+659.83=(341+659)83=1000.83=83000
Tinh mot cach hop li nhat :
a) 512.(2-128) - 128.(-512)
b) 2155-(174 + 2155) + ( -68 + 174)
a, =512 . -126 - 128 . -512
= -512 . 126 - 128 . -512
= -512.[126 - 128]
= -512.-2
=1024
b, =2155 - 174 - 2155 + 106
=2155-2155 - 174 +106
=0 - 174 +106
=-68
a) \(=512\cdot\left(2-128\right)+128\cdot512 \)
\(=512\cdot\left(2-128+128\right)\)
\(=512\cdot2=1024\)
2155 - (174 + 2155) + ( -68 + 174)
= ( 2155 - 2155 ) + ( 174 - 174 ) + ( -68 )
= 0 + 0 + ( -68 )
= -68
Tinh mot cach hop li
-2.8-10,4+0,8-0,6+3,5
so sanh
50^540 va 100^450
Thuc hien phep tinh sau mot cach hop li :
2 - 2 +2
5 9 11
b19: tinh mot cach hop li
a) 387 + (-224) + (-87) b) (-75) + 329 + (-25)
c) (-21) + 24 + (-27) + 31 d) 21.23 - 21.(-17)
e) [12 + (- 57)] - [(-57) - (-12)] f) (- 6). 36 + 6. (- 64)
a: =387-87-224=300-224=76
b: =-75-25+329
=329-100=229
c: =-21-27+31+24=-48+55=7
d: =21(23+17)=21*40=840
e: =12-57+57-12
=0
f: =-6(36+64)=-6*100=-600
giai ho minh voi minh can lam 4 bai nay that la khan truong khong thi teo . bai nay khong o violypic nhung ma minh can gia nhanh de chep vao mai con di haoc cho co giao kiem tra khong hti nhat . nhanh nhanh minh can gap rat rat rat rat la gpa gap khong co thoi gian nua dau ma minh minh can su giup do that la nhanh khong sap chet roi . minh xin chap tay cau mong moi nguoi giup , ra lop taon la may thang mat day chang biet tra on di dau . moi nguoi giup minh .
minh thi xong vong 6 roi nhung bai nay o trong sach co
Tinh mot cach hop li :
e) 88 - 11 . ( 50 + 9 )
f) 85 . ( 35 - 27 ) - 35 . ( 85 - 27 )
g) 33 . ( 17 - 5 ) - 17 . ( 33 - 5 )
giup minh voi minh dang can rat gap
e/ = -561
f/ = -1350
g/ = -80
tích nha..^.^...♥