Bài 1:
\(23,9 + 43,75 =67,65\)
\( 90,1 – 43,87=46,23\)
\( 4,75 x 36,9 =175,275\)
\( 38,106 : 8,7=4,38\)
Bài 2:
a. x + 4,9... 3,04 = 43,1
dấu gì đó ạ
\( b. ( x – 2,8) : 6,7 = 4,03\)
\(( x – 2,8) = 4,03x 6,7\)
\(( x – 2,8) = 27,001\)
\( x = 27,001+ 2,8\)
\(x=29,801\)
\(c. x . 7,5 – 22,5 = 6 \)
\( x . 7,5 = 6 + 22,5 \)
\( x . 7,5 = 28,5\)
\(x=28,5:7,5\)
\(x= 3,8\)
\(d. 9,08 – x : 3,45 = 5,32\)
\( 9,08 – x = 5,32 x3,45\)
\( 9,08 – x = 18,354 \)
\( x = 9,08 –18,354 \)
\( x =-9,274\)