(1 / 5 + 4 / 5 * 1 / 8) divide by 1 / 5, what can be easily calculated should be simply calculated

（1/5+4/5*1/8）1/5 =1/5（1+4/8）1/5 =1+1/2 =1.5

35.48 - (9.4-0.52) simple method

=35.48-10+0.6+1-0.48
=（35.48-0.48）-10+0.6+1
=26.6

48 * 48% + 0.48 * 52

48%=0.48
48×48%+0.48×52
=48×0.48+0.48×52
=（48+52）×0.48
=100×0.48
=48

99 * 0.86 + 0.86 =? Simple calculation,

99*0.86+0.86
=(99+1)*0.86
=100*0.86
=86

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