Question

Dau coroana e urgent ex 27,29,30,32,33.

Answer 1

$27)9 \times 9 + b = 100$

$81 + b = 100$

$b = 100 - 81$

$b = 19$

$5 \times 10 + c = 67$

$50 + c = 67$

$c = 67 - 50$

$c = 17$

$c - 8 \times 7 = 26$

$c - 56 = 26$

$c = 26+ 56$

$c = 82$

$d - 9 \times 6 = 39$

$d - 54 = 39$

$d = 39 + 54$

$d = 93$

$a \div 2 \div 1 = 9$

$a \div 2 = 9 \times 1$

$a \div 2 = 9$

$a = 9 \times 2$

$a = 18$

$b \times 10 - 0 = 10$

$b \times 10 = 10 + 0$

$b \times 10 = 10$

$b = 10 \div 10$

$b = 1$

$28) \frac{n}{4} = 9 = > n= 9 \times 4 = > n = 36$

$\frac{p}{2} = 15 = > p = 2 \times 15 = > p = 30$

$n + p = 36 + 30 = 66$

$66 \div 2 = 33 \: timbre \: are \: fiecare \: dupa \: impartire$

$29)r + g = 22$

$r = g + 6$

$g + 6 + g = 22$

$g + g = 22 - 6$

$2g = 16$

$g = 16 \div 2$

$g = 8$

$r = g + 6$

$r = 8 + 6$

$r = 14$

$30)c = s + 4$

$c + s = 16$

$s + 4 + s = 16$

$s + s = 16 - 4$

$2s = 12$

$s = 12 \div 2$

$s = 6$

$c = s + 4$

$c = 6 + 4$

$c = 10$

$32)c = l \div 9$

$c + l = 100$

$l \div 9 + l = 100 \: | \times 9$

$l + 9l = 900$

$10l = 900$

$l = 900 \div 10$

$l = 90 \: kg$

$33)x \times 5 + 24 = 44$

$5x + 24 = 44$

$5x = 44 - 24$

$5x = 20$

$x = 20 \div 5$

$x = 4$