7.2.5.35+10.25.7+20.70
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a) 14.95+10.25.7+20.70
=(14.5).(95:5)+(10.7).25+20.70
=70.19+70.25+20.70
=70.(19+25+20)
=70.64
=4480
b)(39.42-37.42):42
=42.(39-37):42
=42.2:42
=2.(42:42)
=2.1
=2
1) 20 - (x + 16) = 5
=> x + 16 = 20 - 5 = 15
=> x = 15 - 16 = -1
Vậy x = -1
2) 14.35.5+10.25.7+20.70
= (14.5).35 + (10.7).25 + 20.70
= 70.35 + 70.25 + 20.70
= 70.(35+25+20)
= 70.80
= 5600
3) 22344 + 44688.82
= 22344 + 22344.2.82
= 22344.(1+164)
= 22344.165
= 3686760
Đúng 100%
1) 20 - ( x + 16 ) = 5
x + 16 = 20 - 5
x + 16 = 15
x = -1
tk mk nha ^_^
a) \(\text{13 x 58 x 4 + 32 x 26 x 2 + 52 x 10 }\)
\(\text{=(13 x 4 ) x 58 + 32 x 13 x 2 x 2 + 13 x 4 x 10}\)
\(\text{= ( 13 x 4 ) x 58 + 32 x ( 13 x 2 x 2 ) + ( 13 x 4 ) x 10 }\)
\(\text{= 52 x 58 + 32 x 52 + 52 x 10}\)
\(\text{=52 x ( 58 + 32 + 10 )}\)
\(\text{=52 x 100 = 5200}\)
b) \(\text{14 x 35 x 5 + 10 x 25 x 7 + 20 x 70 x 2}\)
\(\text{= ( 14 x 5 ) x 35 + (10 x 7 ) x 25 + 20 x 70 x 2 }\)
\(\text{= 70 x 35 + 70 x 25 + 20 x 2 x 70 }\)
\(\text{= 70 x ( 35 + 25 + 40 )}\)
\(\text{= 70 x 100 = 7000 }\)
e) \(\text{5.3.37.4+5.24.21+21.5.12}\)
\(\text{= 5.(3.37.4+24.21+21.12)}\)
\(\text{= 5.1200}\)
\(=6000\)
13.58.4 + 32.26.2 + 52.10
= 52.58 + 32.52 + 52.10
= 52.(58+32+10)
= 52.100
=5200
b) 15.37.4 + 120.21 + 21.2.12
= 3.4.5.37 + 12.10.21 + 21.2.12
= 12.185 + 12.210 + 12.42
= 12 ( 185+210+42)
= 12.437
= 5244
c) 25.4 + 10.225 + 6.50
= 100 + 10.225 + 300
= 10.10+10.225+10.30
= 10(10+225+30)
= 10.265
= 2650
rùi giải tiếp
a) 29.64 - 29.24 + 40.81 =
29.(64 - 24) + 40.81 =
29.40 + 40.81 =
40.(29 + 81) =
40.110 = 4400
b) 14.35.5 + 10.25.7 + 20.70 =
70.35 + 70.25 + 20.70 =
70.(35 + 25 + 20) =
70.80 = 5600
c) 48.25 + 48.35 + 48.12 + 52.72 =
48.(25 + 35 + 12) + 52.72 =
48.72 + 52.72 =
72. (48 + 52) =
72.100 = 7200
d) 15.37.4 + 120.21 + 21.5.12 =
60.37 + 60.2.21 + 21.60 =
60.(37 + 42 + 21) =
60.100 = 6000
\(7.2.5.35+10.25.7+20.70\)
\(=\left(7.2.5\right).35+\left(10.7\right).25+20.70\)
\(=70.35+70.25+20.70\)
\(=70.\left(35+25+20\right)\)
\(=70.80\)
\(=5600\)
7.2.5.35 + 10.25.7 + 20.7
= 10.7.35 + 10.7.25 + 20.7
= 7. (10.35 + 10.25 + 20)
= 7. 620
= 4340