Bài 2:
a)38.63+37.38=38(63+37)=3800
b)12.53+53.172– 53.84=53(12+172-84)=5300
c)35.34+35.38+65.75+65.45=35(34+38)+65(75+45)=2520+7800=10320
d)39.8 +60.2 +21.8=8(39+21)+120=480+120=600
e)36.28+36.82+64.69+64.41=36(28+82)+64(69+41)=3960+7040=11000
Bài 2. Tính bằng cách hợp lí nhất:
a) 38. 63 + 37. 38 b) 12.53 + 53. 172– 53. 84
c) 35.34 +35.38 + 65.75 + 65.45 d) 39.8 + 60.2 + 21.8
e) 36.28 + 36.82 + 64.69 + 64.41
tinh nhanh:
a) 35.34+ 35.38+65.75+65.45
b) 12.53+53.172-53.84
c) 36.28+36.82+64.69+64.41
d)4.7.16.25
đ)3.25.8+4.37.6+2.38.12
e) (1999+313)-1999
f) 2023 - (34 + 1560)
Dấu chấm là dấu nhân.
thuc hien phep tinh
a)28.64+14.72
b)3.25.8+4.37.6+2.32.12
c)19.126+37.38
d)35.34+35.38 +65.75+65.45
e)39.8+60.2+21.8
f)36.38+36.82+64.69+64.41
m)37.7+80.3 +43.7
n)43.37+93.43+57.61+69.57
314.67+341.67 +659.83
42.53+47.156-47.114
35.34+35.38.65.75.65.45
39.8+60.2+21+8
36.28=36.82=64.69+64.4
87.23+13.93+70.87
126.23=136.17-40.36
29.87-64.71-23.29 help me
Tính hợp lí
a,185+434+515+266+155
b,12.53+53.17-53.84
c,19.128+36.82+64.69+64.41
Tính nhanh: 36.28 + 36.82 + 64.69 + 64.41
a)42.53+47.156-47.114
b)35.13+35.17+65.75-65.45
c)53.39+47.39-53.21-47.21
d)36.28+36.82+64.69+64.41
e)78.31+78.24+78.17+22.72
1. TÍNH NHANH:
36.28+36.82+64.69+64.41
thực hiện phép tính, tính nhanh, hợp lý
a/ 36.28+36.82+64.69+64.41
b/ 2. 31. 12+4. 6.42+8.27.3
