2道计算题加一道解方程，带过程!!!谁帮帮我啊

1/4×5.6+3.6×25%+4/5×0.25
=0.25×5.6+3.6×0.25+.08×0.25
=0.25（5.6+3.6+0.8）
=0.25×10
=2.5（简便计算）

0.75+5.625×3/4+75%×1.375
=1×0.75+5.625×0.75+0.75×1.375
=0.75×（1+5.625+1.375）
=0.75×8
=6

30%x-1.6=0.8
解：0.3x-1.6=0.8
0.3x=2.4
x=8

加油吧，保证对

1/4×5.6+3.6×25%+4/5×0.25
=1.4+3.6×1/4+4/5×1/4
=1.4+0.9+ 1/5
=1.4+0.9+0.2
=2.5
0.75+5.625×3/4+75%×1.375
=0.75+5.625×0.75+0.75×1.375
=0.75×（1+5.625+1.375）
=0.75×8
=6

30%x-1.6=0.8
0.3x=0.8+1.6
0.3x=2.4
x=2.4/0.3
x=8

1/4×5.6+3.6×25%+4/5×0.25
=1/4×5.6+3.6×1/4+0.8×1/4
=1/4×（5.6+3.6+0.8）
=0.25×10
=2.5

0.75+5.625×3/4+75%×1.375
=0.75+5.625×0.75+0.75×1.375
=0.75×（1+5.625+1.375）
=3/4×8
=6

30%x-1.6=0.8
0.3x=2.4
x=8