Question

脱式计算（能简算的要简算）

1.3/4÷[3/5+2/5×(1-3/8)]
2.0.4×1/2×2又1/2×(2又1/3+5又1/4)
3.7.8÷[32×(1-5/8)+3.6]
4.4÷1又2/3+6×3/5

Answer 1

1.3/4÷[3/5+2/5×(1-3/8)]
=3/4÷[3/5+2/5×5/8]
=3/4÷[3/5+1/4]
=3/4×20/17
=15/17

2.0.4×1/2×2又1/2×(2又1/3+5又1/4)
=0.4×1/2×2又1/2×91/12
=0.4×1/2×5/2×91/12
=91/24
3.7.8÷[32×(1-5/8)+3.6]
=7.8 ÷[32-20+3.6]
=7.8÷15.6
=0.5或1/2
4.4÷1又2/3+6×3/5
=4.4÷5/3+6×3/5
=4.4×3/5+6×3/5
=（4.4+6）×3/5
=52/5×3/5
=156/25