Rút gọn: A = 7 . 9 + 14 . 27 + 21 . 36 / 21 . 27 + 42 . 81 + 62 . 108
Rút gọn A=(7*9+14*27+21*36) / (21*27+42*81+63*108)
rút gọn A=7*9+14*27+21*36/21*27+42*81+63*108
A=7.9+7.9.2.3+7.9.3.4/21.27+21.27.2.3+21.27.3.4
=7.9(1+2.3+3.4)/21.27(1+2.3+3.4)
=7.9/21.27
=7.9/7.9.3.3
=1/9
Rút gọn
M = 7 .9 + 14. 27 + 21 . 36 / 21 . 29 + 42 . 81 + 63 . 108
M = 7 .9 + 14. 27 + 21 . 36 / 21 . 29 + 42 . 81 + 63 . 108 = 7 . 9 (1 + 2.3 + 3.4) / 21( 29 + 2 . 81 + 3 . 108) = 3 . 19 / 29 + 34 . (2 + 22) = 3 . 19 / 29 + 34 . 6 = 57 / 515
Tính
A = 7 . 9 + 14 . 27 + 21 . 36 / 21 . 27 + 42 . 81 + 63 . 108
rút gọn
a = 7*9 + 14*27 +21*36/21*27+42*81
minh dang can gap gup ming voi
So sánh a) A=7×9+14×27+21×36÷21×27+42×81+63×108 & N=37÷333
rút gọn
a) 19 x 28 - 19 x 3 / 5 x 3 + 5 x 35
b) 7 x 9 + 14 x 29 + 21 x 36 / 21 x 27 + 42 x 81 + 63 x 108
c) 11 x 13 - 22 x 26 / 22 x 26 - 44 x54
giúp tui với nha
a)19 x (28 - 3) / 5x (3+35 )
= 19 x 25 /5 x 38
= 475/190
= 5/2
còn mấy ý kia chung j đặt đấy nhé mik hơi lười
Bài 1:Tính hợp lý
a) 36 x 19 + 36 x 81
b) 8 x 12 x 125 x 5
c) \(\frac{7 x 9 + 14 x 27 + 21 x 36}{21 x 27 + 42 x 81 + 63 x 108}\)
\(a,36.19+36.81\)
\(=36.\left(19+81\right)\)
\(=36.100\)
\(=3600\)
\(b,8.12.125.5\)
\(=\left(125.8\right)\left(12.5\right)\)
\(=1000.60\)
\(=60000\)
\(c,\)chịu
c,7 x 9 + 14 x 27 + 21 x 36 / 21 x 27 + 42 x 81 + 63 x 108
7 x 9 + 14 x 27 + 21 x 36 / 7 x 3 x 9 x 3 + 14 x 3 x 27 x 3 + 21 x 3 x 36 x 3
1 / 3 x 3 + 3 x 3 + 3 x 3
1 / 9 + 9 + 9
1 / 27
mấy bọn nguuuuuuuuuuuuuuuuuuuuuuuu
1 Tính bằng cách hợp lý
7*9+14*27+21*63
21*27+42*48+63*108
7*9+14*27+21*63/21*27+42*48+63*108
=63+7*2*9*3+21*63/7*3*9*3+21*2*16*3+63*108
=63+63*6+21*63/63*9+63*32+63*108
=63*(1+6+21)/63*(9+32+108)
=1+6+21/9+32+108
=28/149