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= 62,59 x 43 x 2 + 693,27 x 57 + 894,92 x 43 + 306,73 x 57
= (62,59 x 2 + 894,92) x 43 + ( 693,27 + 306,73 ) x 57
= 1020,1 x 43 + 1000 x 57
= 43864,3 + 57000
= 100864,3
Cách làm thì đúng nhưng mình hông biết kết quả có đúng không. kiểm tra lại nha
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\(a,\left(4x-8\right)\left(12-y\right)=0\)
\(\Rightarrow\hept{\begin{cases}4x-8=0\\12-y=0\end{cases}}\)
\(\Rightarrow\hept{\begin{cases}4x=8\\y=12\end{cases}}\)
\(\Rightarrow\hept{\begin{cases}x=2\\y=12\end{cases}}\)
\(b,\left(2x-12\right)-14=86\)
\(\Rightarrow2\left(x-6\right)=86+14=100\)
\(\Rightarrow x-6=50\)
\(\Rightarrow x=50+6=56\)
\(c,\left(127-x\right)-17=43\)
\(\Rightarrow127-x=43+17=60\)
\(\Rightarrow x=127-60=67\)
\(\left(4x-8\right)\left(12-y\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}4x-8=0\\12-y=0\end{cases}\Leftrightarrow\orbr{\begin{cases}4x=8\\y=12-0\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=2\\y=12\end{cases}}}\)
Vậy x = 2 hoặc y = 12
\(\left(2x-12\right)-14=86\)
\(\Leftrightarrow2x-12=100\)
\(\Leftrightarrow2x=112\)
\(\Leftrightarrow x=56\)
Vậy x = 56
\(\left(127-x\right)-17=43\)
\(\Leftrightarrow127-x=60\)
\(\Leftrightarrow x=127-60\)
\(\Leftrightarrow x=67\)
Vậy x = 67
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phép tính này có quy tắc :
nhân chia trước, cộng trừ sau.
trong ngoặc trc ngoài ngoặc sau
tíc mình nha
(42 x 43 + 43 x 57 + 43) - 360 : 4
= 4426549 - 360 : 4
= 4426549 - 90
= 4426459
(372 - 19 x 4 + (981 : 9 - 13)
= 296 + 96
= 392
456 : 2 x 18 + 456 : 3 - 102
= 4104 + 50
= 4154
>_< học tốt
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a) \(\left(42\times43+43\times57+43\right)-360:4\)
\(=43\times\left(42+57+1\right)-90\)
\(=43\times100-90\)
\(=4300-90\)
\(=4210\)
b) \(\left(372-19\times4\right)+\left(981:9-13\right)\)
\(=\left(4\times93-19\times4\right)+\left(109-13\right)\)
\(=4\times\left(93-19\right)+109-13\)
\(=4\times74+109-13\)
\(=296+109-13\)
\(=392\)
c) \(456:2\times18+456:3-102\)
\(=456\times\frac{1}{2}\times18+456\times\frac{1}{3}-102\)
\(=456\times\left(\frac{1}{2}\times18+\frac{1}{3}\right)-102\)
\(=456\times\left(9+\frac{1}{3}\right)-102\)
\(=456\times\frac{28}{3}-102\)
\(=4256-102\)
\(=4154\)
ko bk tính nhanh!
a)( 42 x 43 + 57+43 ) - 360 :4 b) (372 - 19 x 4 ) + ( 981 : 9 - 13 )
= 43 x (42 + 57 +1 ) - 90 = (372 - 76 ) + ( 109 - 13)
= 43 x 100 - 90 = 296 + 96
= 4300 - 90 = 392
= 4210
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= [43 x ( 42 + 57 + 1)] - 90
= (43 x 100) -90
= 4300 - 90
= 4210
a,( 42 x 43 + 43 x 57 + 43 ) - 360 : 4
= [ 43 x ( 42 + 57 + 1 ) ] - 90
= [ 43 x 100 ] - 90
= 4300 - 90
= 4210
b, 372 - 19 x 4 - 981 : 9 - 13
= 372 - 76 - 109 - 13
= 174
c, 452 : 2 x 18 - 456 : 3 - 102
= 226 x 18 - 152 - 102
= 4068 - 152 - 102
= 3814
43 × ( x - 19 ) = 86
x - 19 = 86 : 43
x - 19 = 2
x= 2 + 19
x = 21
43 x ( x - 19 ) = 86
( x - 19 ) = 86 : 43
x - 19 = 2
x = 2 + 19
x = 21