1) tính nhanh
64x25+25x25+25
58x42+32x8+5x16
42x43+43x57+43)-360:4
372-19x4)+(981:9-13)
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(42x43+43x57+43)-360:4=(43x(42+57+1))-90
=(43x100)-90
=4300-90
=4210
A) ( 42 x 43 + 43 x 57 + 43 ) - 360 : 4
= ( 42 x 43 + 43 x 57 + 43 x 1 ) - 360 : 4
= [ 43 x ( 42 + 57 + 1 ) ] - 360 : 4
= ( 43 x 100 ) - 360 : 4
= 4300 - 360 : 4
= 4300 - 90
= 4210
B) 322 - 19 x 4 + ( 981 : 9 - 13 )
= 322 - 19 x 4 + ( 109 - 13 )
= 322 - 19 x 4 + 96
= 322 - 76 + 96
= 246 + 96
= 342
C) 450 : 2 x 18 + 456 : 3 - 120
= 225 x 18 + 152 - 120
= 4050 + 152 - 120
= 4202 - 120
= 4082
( 372-19x4)+(981:9-13)
= ( 372-76)+(109-13)
= 296+96
= 392
456:2x18+456:3-102
= 4104 + 456:3-102
= 4104 + 152-102
= 3850
`@` `\text {Ans}`
`\downarrow`
\((42 \times 43+43 \times 57+43)-360 \div 4\)
`= 43 \times (42 + 57 + 1) - 90`
`= 43 \times 100 - 90`
`= 4300 - 90`
`= 4210`
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
=25x(64+25+1)
=25x90
=2250
1) tính nhanh
cau 1 :64x25+25x25+25
cau 2 :58x42+32x8+5x16
cau 3 :42x43+43x57+43)-360:4
cau 1 :372-19x4)+(981:9-13)