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a )
12,75 - 7,28 - 1,72
= ( 12,75 - 7,28 ) - 1,72
= 5,47 - 1,72
= 3,75
nếu đúng tk giúp mk nha!
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Phần a: 5,6x2+2,8x8+5,6x4 =5,6x2+2,8x2x4+5,6x4 =5,6x2+5,6x4+5,6x4 =5, 6 x ( 2+ 4 + 4 ) =5,6x10=56 Phan b:0,2468+0,08x0,4x12,5x2,5+0,7532 =0,2468+1+0,7532 =2 NHỚ TK NHA BN ! mik chac 100% luon ! mik trả lời đầu tiên ma !
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a) 3/5 + 0,75 + 4/15+ 1/4
= 3/5 + 3/4 + 4/15 + 1/4
= ( 3/5 + 4/15 ) + ( 3/4 + 1/4 )
= ( 9/15 + 4/15 ) + 1
= 13/15 + 1
= 28/15
Cbht!!!!
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( x - 1,75 ) : 0,01 /20 = 1025
( x - 1,75 ) : 0,01 = 20500
x - 1,75 = 205
x = 206,75
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3/4 x 17 + 3/4 x 5 - 3/4 x 3 x 4
= 3/4 x (17 + 5 - 12 )
= 3/4 x 10
= 30/4
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0,2019 : 0,01 + 20,19 x 95 + 20,19 : 0,25
= 0,2019 x 100 + 20,19 x 95 + 20,19 x 4
= ( 0,2019 x 100 ) + 20,19 x 95 + 20,19 x 4
= 20,19 + 20,19 x 95 + 20,19 x 4
= 20,19 x ( 1 + 95 + 4)
= 20,19 x 100
= 2019