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a) \(142-\left[50-\left(2^3.10-2^3.5\right)\right]\)
= \(142-\left[50-\left(8.10-8.5\right)\right]\)
= \(142-\left[50-8.\left(10-5\right)\right]\)
= \(142-\left[50-8.5\right]\)
= \(142-\left[50-40\right]\)
= \(142-10\)
= \(132\)
b) \(375:\left\{32-\left[4+\left(5.3^2-42\right)\right]\right\}-14\)
= \(375:\left\{32-\left[4+\left(5.9-42\right)\right]\right\}-14\)
= \(375:\left\{32-\left[4+\left(45-42\right)\right]\right\}-14\)
= \(375:\left\{32-\left[4+3\right]\right\}-14\)
= \(375:\left\{32-7\right\}-14\)
= \(375:25-14\)
= \(15-14\)
= \(1\)
Chúc bạn học tốt !!!
a) 142 - [ 50 - ( 23 . 10 - 23 . 5 )]
= 142 - [ 50 - ( 8 . 10 - 8 . 5 )]
= 142 - [ 50 - ( 80 - 40 )]
= 142 - [ 50 - 40 ]
= 142 - 10
= 132
b) 375 : { 32 - [ 4 + ( 5 . 32 - 42 )]} - 14
= 375 : { 32 - [ 4 + ( 5 . 9 - 42 )]} - 14
= 375 : { 32 - [ 4 + ( 45 - 42 )]} - 14
= 375 : { 32 - [ 4 + 3 ]} - 14
= 375 : { 32 - 7 } - 14
= 375 : 25 - 14
= 15 - 14
= 1
\(142-\left[50-\left(2^3.10-2.5\right)\right]\)
= \(142-\left[50-\left(80-10\right)\right]\)
= \(142-\left(50-70\right)\)
= \(142-\left(-20\right)\)
= \(162\)
\(142-\left[50-\left(2^3\cdot10-2\cdot5\right)\right]\)
\(=142-50+80+10\)
\(=72+90\)
=162
a,47-[(45×16-25×12):14]
=47-[(720-300):14]
=47-[420:14]
=47-30
=17
b,50-[(20-8):2+34]
=50-[12:2+34]
=50-[6+34]
=50-40
=10
c,100-[60:(5^2-15)]
=100-[60÷(25-15)]
=100-[60÷10]
=100-6
=94
d,50-[(50-8×5)÷2+3]
=50-[(50-40)÷2+3]
=50-[10÷2+3]
=50-[5+3]
=50-8
=42
e,10-[(64-48).5+(8×10+8)]÷28
=10-[16.5+(80+8)]÷28
=10-[80+88]÷28
=10-168÷28
=10-6
=4
( bạn tự viết đầu bài nhé)
a,47-[(45×16-25×12):14]
=47-[(720-300):14]
=47-[420:14]
=47-30
=17
b,50-[(20-8):2+34]
=50-[12:2+34]
=50-[6+34]
=50-40
=10
c,100-[60:(5^2-15)]
=100-[60÷(25-15)]
=100-[60÷10]
=100-6
=94
d,50-[(50-8×5)÷2+3]
=50-[(50-40)÷2+3]
=50-[10÷2+3]
=50-[5+3]
=50-8
=42
e,10-[(64-48).5+(8×10+8)]÷28
=10-[16.5+(80+8)]÷28
=10-[80+88]÷28
=10-168÷28
=10-6
=4
a) 310 . 315 : 322 + 47 : 44
= 3(10 + 15 - 22 ) + 4(7-4)
= 33 + 43
= ( 3.4)3
=123
b)[ (52 . 53 ) - 72 . 2 ) : 2 ] . 6 = 7 . 25
[ (52 . 53 ) - 72 . 2 ) : 2 ] . 6 = 7 . 32
= 224
\(142-\left[50-\left(2^3×10-2^3×5\right)\right]\)
\(=142-\left[50-\left(8×10-8×5\right)\right]\)
\(=142-\left[50-\left(80-40\right)\right]\)
\(=142-\left[50-40\right]\)
\(=142-10\)
\(=132\)
142-[50-(8 x 10 - 8 x5)]
142-{50-[8 x(10-5)}
142-{50-8 x 5}
142-{50-40}
142-10
132
a) \(100-\left[90+\left(50-2^3.5\right)\right]\)
\(=100-\left[90+\left(50-8.5\right)\right]\)
\(=100-\left[90+\left(50-40\right)\right]\)
\(=100-\left[90+10\right]\)
\(=100-100\)
\(=0\)
b) \(-10-\left(-72+8\right)\)
\(=-10-\left(-64\right)\)
\(=54\)
Hc tốt
a) 100 - [90 + (50 - 23 . 5)]
= 100 - [90 + (50 - 8 . 5)]
= 100 - [90 + (50 - 40)]
= 100 - (90 + 10)
= 100 - 100 = 0
b) -10 - (-72 + 8)
= -10 - (-64)
= -10 + 64
= 54
#Học tốt!!!
~NTTH~
a.=47-[45.16-25.12]:14]
=47-420:14
=47-30
=17
b.=50-[12:2+34]
=50-40
=10
c.=100-60:10
=100-6
=94
d.50-[(50-40);2+3]
=50-(10:2+3)
=50-8
=42
`A = 142 - [50-(2^3 - 10 - 2^3 . 5)]`
`A = 142 - [50-(8 - 10 - 8 . 5)]`
`A = 142 - [50-(-2 - 40)]`
`A = 142 - [50-(-42)]`
`A = 142 - (50+42)`
`A = 142 - 50-42`
`A = (142 - 42) - 50`
`A = 100 - 50`
`A = 50`