CHO bieu thuc
B=17,58*43+57*17,58/293*A
a)tim gia tri cua bieu thuc Bkhi a=2
b)tinh gia tri a khi B=2
c)tim gia tri so tu nhien ad biet bieu thuc B co gia tri lon nhat ,gia tri lon do la bao nhieu
tinh gia tri cua cac bieu thuc sau roi so sanh cac ket qua tinh duoc
(-25)-(-12), 18+(14-42), (-18)-13+17
Tinh nhanh cac gia tri cua bieu thuc
[ ( 2 mu 5:2-2 mu 2×2 mu 2)×9999]+10000
tinh nhanh gia tri cac bieu thuc sau
a , 1/ 2+ 1 /3 + 1 / 4 + 1/ 6
b, 53 / 4 . 11/ 16 - 23/4 . 11/16
c, 3/ 8 . ( 2 /9 + 4 /15 )
Tinh cac gia tri bieu thuc sau:
C= c*5/4 +c* 1/6-c* 17/12 voi c=2013/2014
Tinh gia tri cac bieu thuc sau
a) A = \(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{49.50}\)
Khong tinh gia tri hay chung to cac bieu thuc sau la hop so
A=11.13.17-137
tinh gia tri cac bieu thuc sau theo cach hop li nhat
A=25.(4-300)
B=83.35-35.183
tinh gia tri bieu thuc
A=17+46+79+34+53
B=-377-(98-277)
tinh nhanh gia tri bieu thuc 1/2+ 1/22