这道题怎么做
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一、9.9×1.02
=10×1.02-0.1×1.02
=10.2-0.102
=10.098
【5.7÷(0.09+0.1)+2.4】÷0.54
=【5.7÷0.19+2.4】÷0.54
=【3+2.4】÷0.54
=5.4÷0.54
=10
6.4×(125×0.125)
=(0.8×125)×(8×0.125)
=100×1
=100
81000÷(27×78+27×22)
=81000÷【27×(78+22)】
=81000÷【27×100】
=81000÷2700
=30
(18.5×3.6+3.6×2.5)÷0.18
=(18.5+2.5)×3.6÷0.18
=21×(3.6÷0.18)
=21×20
=420
二、0.9÷(2.06-x)=4.5
2.06-x=0.2
x=1.86
(x-8.2+10.8)÷2=1.8
(x+2.6)÷2=1.8
x+2.6=3.6
x=1
3.6x-x-0.1x=0.7
2.5x=0.7
x=0.28
三、12×2÷3-5
=24÷3-5
=8-5
=3米
(40×2+43.5+44.5)÷(2+2)
=(80+43.5+44.5)÷4
=168÷4
=42千米/小时
小巧232÷(3+1)
=232÷4
=58张
小胖58×3=174张
=10×1.02-0.1×1.02
=10.2-0.102
=10.098
【5.7÷(0.09+0.1)+2.4】÷0.54
=【5.7÷0.19+2.4】÷0.54
=【3+2.4】÷0.54
=5.4÷0.54
=10
6.4×(125×0.125)
=(0.8×125)×(8×0.125)
=100×1
=100
81000÷(27×78+27×22)
=81000÷【27×(78+22)】
=81000÷【27×100】
=81000÷2700
=30
(18.5×3.6+3.6×2.5)÷0.18
=(18.5+2.5)×3.6÷0.18
=21×(3.6÷0.18)
=21×20
=420
二、0.9÷(2.06-x)=4.5
2.06-x=0.2
x=1.86
(x-8.2+10.8)÷2=1.8
(x+2.6)÷2=1.8
x+2.6=3.6
x=1
3.6x-x-0.1x=0.7
2.5x=0.7
x=0.28
三、12×2÷3-5
=24÷3-5
=8-5
=3米
(40×2+43.5+44.5)÷(2+2)
=(80+43.5+44.5)÷4
=168÷4
=42千米/小时
小巧232÷(3+1)
=232÷4
=58张
小胖58×3=174张
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