----- Nội dung dịch tự động từ ảnh -----
Bài 1: Tìm x:
a) 165: x=3
b)
x-71129
c) 22+x=52
Bài 2: Tìm x:
a) 71-(33+ x) = 26
b) (x+73)-26=76
c) 45 (x+9)=6
d) 89 (73-x) = 20
e) (x + 7)-25 = 13
f) 198-(x + 4) = 120
g) 2(x-51)=2.2³ + 20
h) 450 (x-19) = 50
i) 4(x-3)=7²-110
Bài 3: Tìm x:
a)
7x-5=16
b)
156-2x = 82
c) 10x + 65 = 125
d)
8x + 2x = 25.2²
e)
15+ 5x = 40
f) 5x + 2x=6²-5°
g)
h)
5x + x = 150:2+3
6x + x = 5¹:5⁹ +3¹
i)
5x + 3x = 36: 3³.4 +12
j) 4x + 2x = 68-2¹9:2¹6
Bài I: Tỉnh nhanh
a) 58.75 + 58.50-58.25
b)
27.39+27.63 -2.27
c) 128.46 +128.32 + 128.22
d) 66.25 +5.66 + 66.14 + 33.66
e) 12.35 +35.182-35.94
f) 35.23 +35.41 +64.65
g) 29.87-29.23 +64.71
Bài 1: Tính tổng:
a) S₁=1+2+3+...+999
b) S₂ = 10 + 12 + 14+...+2010
c) S3 = 21 +23+25+...+1001
d) S₁ = 24+25 +26+ ... + 125 + 126
e) Ss = 1+4+7+...+79
III. TÌM X
d) 2x = 102
e) x+19=301
f) 93-x=27
j) 140 (x-8)=7
k) 4(x +41) = 400
1)
11(x-9)=77
m) 5(x-9) = 350
n) 2x 49 = 5.3²
f) S6=15+17+19+21+...+ 151 + 153 + 155
g) S, 15+25+35+...+115
o) 200 (2x+6)=4³
p) 135-5(x + 4) = 35
q) 25+3(x-8) = 106
r) 3²(x + 4)-5² = 5.2²
k) 5x+x=39 – 311.39
1) 7x-x=521:519 +3.2² -7°
m) 7x-2x = 6¹7: 6¹5+44:11
n) 0:x=0
0) 3=9
p) 4* = 64
q) 2 = 16
r) 9-1=9
s) x¹ = 16
t) 2:25 = 1
IV. TÍNH NHANH
h)
48.19+48.115 + 134.52
j)
i) 27.121-87.27 + 73.34
125.98-125.46-52.25
k) 136.23+ 136.17-40.36
1) 17.93 +116.83 +17.23
m) 19.27+ 47.81 + 19.20
n) 87.23 + 13.93 +70.87
V. TÍNH TỔN