Tính nhanh 27×36+24×64
Bai1 tính nhanh phép tính
a) 37581-9999
Bài2 tính nhanh
a) 36×28+36×82+64×69+64×41
b) A=41×66+34×41/3+7+11+...+79
c) 1×5×6+2×10×12+4×20×24+9×45×54/1×3×5+2×6×10+4×12×20+9×27×45
Bài 1 :
a) 37581 - 9999 = 37581 - 10000 - 1 = 27581 - 1 = 27580
k cho mình nha bạn !
a)37581-9999=37581-(9999+1-1)=37581-(10000+1)=37581-10000-1=27581+1=27582
Tính nhanh
a) 2 . 31 . 12 + 4 . 6 . 42 + 8 . 27 . 3
b) 36 . 28 + 36 . 82 + 64 . 69 + 64 . 41
mik đầu tiên nhé bạn !
a) 2.31.12+4.6.42+8.27.3
=24.31+24.42+24.27
=24.(31+42+27)
=24.100
=2400
b) 36.28+36.82+64.69+64.41
=36.(28+82)+64.(69+41)
=36.110+64.110
=110.(36+64)
=110.100
=11000
Tính nhanh:
a) 2 . 31 . 12 + 4 . 6 . 42 + 8 . 27 . 3
b) 36 . 28 + 36 . 82 + 64 . 69 + 64 . 41
a) 2 . 31 . 12 + 4 . 6 . 42 + 8 . 27 . 3
= 24 . 31 + 24 . 42 + 24 . 27
= 24 . (31 + 42 + 27)
= 24 . 100
= 2400
b) 36 . 28 + 36 . 82 + 64 . 69 + 64 . 41
= 36 . (28 + 82) + 64 . (69 + 41)
= 36 . 110 + 64 . 110
= (36 + 64) . 110
= 100 . 110
= 11000
Tính nhanh:
a. 2 . 31 .12 + 4 . 6 . 42 + 8 . 27 . 3
b. 36 . 28 + 36 . 83 + 64 .69 + 64 . 41
a.2.31.12+4.6.42+8.27.3
=2.12.31+4.6.42+8.3.27
=24.31+24.42+24.27
=24.(31+42+27)
=24.100
=2400
b.36.28+36.83+64.69+64.41
=36.(28+83)+64.(69+41)
=36.111+64.111
=(36+64).111
=100.111
=11100
Tính nhanh
a , 2 . 31 . 12 + 4 . 6 . 42 + 8 . 27 . 3
b, 36 . 28 + 36 . 82 + 64 . 69 + 64 . 41
a) 2.31.12+4.6.42+8.27.3
=24.31+24.42+24.27
=24.(31+42+27)
=24.100
=2400
b) 36.28+36.82+64.69+64.41
=36.(28+82)+64.(69+41)
=36.110+64.110
=110.(36+64)
=110.100
=11000
a = 24 . 31 + 24 . 42 + 24 . 27
= 24 . 100
= 2400
b = 36 . ( 28 + 82 ) + 64 . ( 69 + 41 )
= 36 . 110 + 64 . 110
= 110 . ( 36 + 64 )
= 100 . 100 = 11000
a = 24 . 31 + 24 . 42 + 24 . 27
= 24 . 100
= 2400
b = 36 . ( 28 + 82 ) + 64 . ( 69 + 41 )
= 36 . 110 + 64 . 110
= 110 . ( 36 + 64 )
= 110 . 100 = 11000
tính nhanh
a) 2 . 31 . 12 + 4 . 6 . 42 + 8 . 27 . 3
b) 36 . 28 + 36 . 82 + 64 . 69 + 64 . 41
ai nhanh và đúng mình like
a) 2.31.12+4.6.42+8.27.3
= [(2.12).31]+[(4.6).42]+[(8.3).27]
= 24.31+24.42+24.27
= 24.(31+42+27)
= 24.100
= 2400
b) 36.28+36.82+64.69+64.41
= (36.28+36.82)+(64.69+64.41)
= [36.(28+82)]+[64.(69+41]
= 36.110+54.110
= 110.(36+54)
= 110.90
= 200
a) 2 . 31 .12 + 4 .6 .42 + 8 .27 .3
= 2 .12 .31 + 4 . 6 .42 + 8 . 3 .27
= 24 . 12 + 24 . 42 + 24 . 27
= 24 . ( 12 + 42 + 27 )
= 24 . 86
= 2064
b) 36 . 28 + 36 . 82 + 64 . 69 + 64 . 41
= 36. ( 28 + 82 ) + 64 . ( 69 + 41 )
= 36 . 110 + 64 . 110
= ( 36 + 64 ) . 110
= 100 . 110
= 11000
tính nhanh
a) 2 . 31 . 12 + 4 . 6 . 42 + 8 . 27 . 3
b) 36 . 28 + 36 . 82 + 64 . 69 + 64 . 41
a) 2.31.12+4.6.42+8.27.3
= [(2.12).31]+[(4.6).42]+[(8.3).27]
= 24.31+24.42+24.27
= 24.(31+42+27)
= 24.100
= 2400
b) 36.28+36.82+64.69+64.41
= (36.28+36.82)+(64.69+64.41)
= [36.(28+82)]+[64.(69+41]
= 36.110+54.110
= 110.(36+54)
= 110.90
= 200
tính nhanh
A, 2x31 x12 +4x6 x42 +8 x 27 x3
b, 36 X 28 +36 x 82 +64 x 69 + 64 x41
a, 2 x 31 x 12 + 4 x 6 x 42 + 8 x 27 x 3
=( 2 x 12 ) x 31 + ( 4 x 6 ) x 42 + ( 8 x 3 ) x 27=24 x 31 + 24 x 42 + 24 x 27=24 x ( 31 + 42 + 27 )=24 x 100=2400b,36 x 28 + 36 x 82 + 64 x 69 + 64 x 41=36 x ( 28 + 82 ) + 64 x ( 69 + 41 )=36 x 110 + 64 x 110=( 36 + 64 ) x 110=100 x 110=11000Tính nhanh :
a, 24 . 64 + 36 . 24 - 100 . 24
b, 5 . 4² - 16 : 2²
\(a.24.64+36.24-100.24\)
\(=24.\left(64+36-100\right)\)
\(=24.0\)
\(=0\)
\(b.5.4^2-16:2^2\)
\(=5.16-16:4\)
\(=80-4\)
\(=76\)
Hok tốt
a, 24.64+36.24-100.24
=24.(64+36-1000
=24.0
=0
b, 5.4^2-16:2^2
=80-4
=76
a, 24 . 64 + 36 . 24 - 100 . 24
= 24 . ( 64 + 36 ) - 100
= 24 . ( 100 - 100 )
= 24 . 0
= 0
Tính nhanh
a) 2 . 31 . 12 + 4 . 6 . 42 + 8 . 27 . 3
b) 36 . 28 + 36 . 82 + 64 . 69 + 64 . 41
a) A = 2.31.12 + 4.6.42 + 8.27.3
= 24.31 + 24.42 + 24.27
= 24.(31 + 42 + 27)
= 24.100 = 2400
b) B = 36.28 + 36.82 + 64.69 + 64.41
= 36.(28 + 82) + 64.(69 + 41)
= 36.110 + 64.110
= 110.(36 + 64)
= 110.100
= 11000
a, 2 . 31 . 12 + 4 . 6 . 42 + 8 . 27 . 3
= 24 . 31 + 24 . 42 + 24 . 27
= 24 . ( 31 + 42 + 27 )
= 24 . 100 = 2400
b, 36 . 28 + 36 . 82 + 64 . 69 + 64 . 41
= 36 . ( 28 + 82 ) + 64 . ( 69 + 41 )
= 36 . 110 + 64 . 110
= 110 . ( 36 + 64 )
= 110 . 100 = 11000