Question

下面各题简算

0.4x（12x2.5)
四分之一乘四除以四分之一乘四
十三分之八除以七加七分之一乘十三分之五

Answer 1

0.4×（12×2.5
=0.4×2.5×12
=1×12
=12
1/4×4÷1/4×4
=1/4÷1/4×4×4
=1×16
=16
8/13÷7+1/7×5/13
=8/13×1/7+1/7×5/13
=（8/13+5/13）×1/7
=1×1/7
=1/7
（望采纳，谢谢）

Answer 2

0.4×2.5×12
=1×12
=12

1／4 × 4 ÷ 1／4 ×4
=1×4×4
=16

8／13 ÷7+1／7 × 5／13
=8／13 × 1／7 +1／7× 5／13
=（8／13 + 5／13）× 1／7
=1 × 1／7
=1／7

／为分数线