Question

Tính thuận tiện :5.6*2+2.8*8+11.2*2-48.5

Tìm x biết  0.336*x/0.35=0.6

Answer 1

5.6 x 2 + 2.8 x 8 + 11.2 x 2- 48.5

= 2.8 x 2 x 2 + 2.8 x 8 + 2.8 x 4 x2 - 48.5

= 2.8 x 4 + 2.8 x 8 + 2.8 x 8 - 48.5

= 2.8 x (4+8+8) - 48.5

= 2.8 x 20 - 48.5

= 560 - 48.5

= 511.5 

Answer 2

Sai rồi Lê Ngân Giang