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a) \(47.33+47+66.47=47.\left(33+1+66\right)=47.100=4700\)
b) \(24.57+43.24=24.\left(57+43\right)=24.100=2400\)
c) \(387.2694+7305.387+387=387.\left(2694+7305+1\right)=387.10000=3870000\)
d) \(563.78-26.563+563.48=563.\left(78-26+48\right)=563.100=56300\)
a. 47.33 + 47 + 66.47
= 47.(33 + 1 + 66)
= 47 . 100
= 4700
b. 24.57 + 43.24
= 24. (57 + 43)
= 24 . 100
= 2400
c. 387 . 2694 + 7305.387 + 387
= 387. (2694 + 7305 + 1)
= 387 . 10000
= 3870000
d. 563 . 78 - 26.563 + 563.48
= 563. (78 - 26 + 48)
= 563 . 100
= 56300
a) 13 . 57 + 43.13 = 13.(57 + 43)
= 13 . 100 = 1300
b) 39 . 28 + 39 . 72 = 39 . (28 + 72)
= 39 . 100 = 3900
c) 345 . 69 - 245 . 67 = (345 - 245) . 67
= 100 . 67 = 6700
d) 123 . 34 + 123 . 26 + 123. 40 = 123 . (34 + 26 + 40)
= 123 . 100 = 12300
e) 974 . 34 + 974 . 96 - 974 . 30 = 974 . (34 + 96 - 30)
= 974 . 100 = 97400
f) 37 . 148 - 37 . 53 + 37 . 5 = 37 . (148 - 53 + 5)
= 37 . 100 = 3700
9) 47 . 173 + 47 + 66.47 = 47 . (173 + 1 + 66)
= 47 . 240 = 11280
h, i ) tự làm
a) 89.99 + 11.99= 99(89+11)= 99.100=9900
b) 125.43 - 25.43= 43(125-25)=43.100=4300
c) 156.53 + 156.47=156(53+47)= 156.100=15600
d) 567.27 + 57.567 + 16.567=567(27+57+16)= 567.100=56700
f) 39.156 - 39.57+ 39= 39(156-57+1)=39.100
g) 56.37 + 37.189 - 145.37=37.(56+189-145)= 37.100=3700
h) 123.46 + 123.78 - 123.37 +123.3=123(46+78-37+3)=123.90=11070
i) 12.19+ 12=12(19+1)= 12.20=240
tk mik nhá
387.2694+7305.387+387
=387.2694+7305.387+38.1
=387.(2694+7305+1)
=387.10000
=3870000
a)387.2694+7305.387+387
= 387.2694+7305.387+387.1
=387.(2694+7305+1)
=387.10000
=3870000
387.2694+7305.387+387
=387.2694+7305.387+387.1
=387.(2694+7305+1)
=387.10000
=3870000
a.120-[7.20-(134-110).5]
=120-(7.20-24.5)
=120-(140-120)
=120-20
=100
b.1987-200.8+1005:5
=1987-1600+201
=588
C, 387.2694+7305.387+387
=387.(2694+7305+1)
=387.10000
3870 000
d,
d.248:{[(368+232):120-3]+122}+2016
=248:{(600:120-3)+122}+2016
=248:(2+122)+2016
=248:144+2016
=2+2016
=2018
\(\left(800+53\right).53+\left(900-47\right).47\)
\(=853.53+853.47\)
\(=853.\left(53+47\right)\)
\(=853.100\)
\(=85300\)
(800+53).53+(900-47).47=853.53+853.47=853.(53+47)=853.100=85300
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TÍNH HỢP LÍ
A) 31.(-18)+31.(-81)-31
=31.((-18)+(-81)-1)
=31.(-100)
=-3100
B) (-12).47+(-12).52+(-12)
=(-12).(47+52+1)
=(-12).100
=-1200
C)13.(23+22)-3.(17+28)
=13.45-3.45
=45.(13-3)
=45.10
=450
D)-48+48.(-78)+48.(-21)
=(-48).(1+78+21)
=(-48).100
=-4800
47.173 + 47 - 47.74
= 47.( 173 + 1 - 74 )
= 47. 100
= 4700
47.33 + 47 + 66.47
24.57 + 43.24
387.2694 + 7305.387 + 387
12.19 + 12
195.56 + 43.105 + 195