a/ 19.27 + 47.81 + 19.20
= 19.(27 + 20) + 47.81
= 19.47 + 47.81
= 47.(19 + 81)
= 47 . 100
= 4700
b/ 87.23 + 13.93 + 70.87
= 87.(23 + 70) + 13.93
= 87.93 + 13.93
= 93.(87 + 13)
= 93 .100
= 9300
a.86.28
b.172.03
chúc học tốt! =))
Bài 7: Tính nhanh: a) 136.23 + 136.17 – 40.36 b) 17.93 + 116.83 + 17.23 b) 19.27 + 47.81 + 19.20 c) 87.23 + 13.93 + 70.87
TÍNH NHANH:
a,29.87-29.23+64.71
b,19.27+47.81+19.20
c,87.23+13.93+70.87
Tính nhanh:
A) 58.75+58.50-58.25
B) 27.39+27.63-2.27
C) 128.46+128.32+128.22
D) 12.35+35.182-35.94
E) 48.19+48.115+134.52
F) 136.23+136.17-40.36
G) 17.93+116.83+17.23
H) 19.27+47.81+19.20
I) 87.23+13.93+70.87
A) 58.75+58.50-58.25
B) 27.39+27.63-2.27
C) 128.46+128.32+128.22
D) 12.35+35.182-35.94
E) 48.19+48.115+134.52
F) 136.23+136.17-40.36
G) 17.93+116.83+17.23
H) 19.27+47.81+19.20
I) 87.23+13.93+70.87
Tính nhanh
17.93+116.83+17.23
19.27+47.81+19.20
87.23+13.93+70.87
78+31+78.24+78.17+22.72
136.23+136.17-40.36
53.39+47.39-53.21-47.21
2.53.12+4.6.87-3.8.40
5.7.77-7.150+49.25+15.42
bài 1: tính nhanh
a) 48.19+48.115+134.52
b) 27.121-87.27+73.34
c)125.98-125.46-52.25
d) 136.23+136.17-40.36
e) 17.93+116.83+17.23
ê)19.27+47.81+19.20
f) 87.23+13.93+70.87
A 48.19 +48.115 +134.52
B, 27.121 - 87.27 + 73.34
C, 125.98 - 125.46. -52.23
D, 136.23 + 136.17 +40.36
E, 17.93 + 116.83 + 17.23
F, 19.27 + 47.81 + 19.20
G, 87.23 + 13.93 + 70.87
Các bạn giúp mình nhé ! Cảm ơn
Bài 1 : Tìm x
96-x.(x+1)=42
Bài 2 : Tính Nhanh
a,19.27+47.81+19.20
b,87.23+13.93+70.87
Bài 3: Tính Tổng
a,1+4+7+...+79
b,15+17+19+21+...+151+153+155
c,15+25+35+...+115
d,24+25+28+...+125+126
87.23+13.93+70.87
