Question

calculeaza respectand regurile invatate?a)(8+9)×(80-69)=?b)100:10×(7+3)=?c)7×4+(87-79)×(36:4)=?

Answer 1

a) (8+9)x(80-69)
=17x11
=187

b) 100:10x(7+3)=
=10x10
=100

c) 7x4+(87-79)x(36:4)=
=28+8x9
=28+72
=100

Answer 2

$a) \: (8 + 9) \times( 80 - 69) = \\ 17 \times 11 = \\ 187 \\ b) \: 100 \div 10 \times (7 + 3) = \\ 10 \times 10 = 100 \\ c) \: 7 \times 4 + (87 - 79) \times (36 \div 4) = \\ 7 \times 4 + 8 \times 9 = \\ 28 + 72 = 100$