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计算下面各题.能简便的用简便方法计算4.05÷0.5+10...

①4.05÷0.5+10.75,=8.1+10.75,=18.85;②21.6÷0.8-1.2×5,=27-6,=21;③6.8×2.7+2.7×3.2,=(6.8+3.2)×2.7,=10×2.7,=27;④8.4×6.9÷(6.44-4.14),=8.4×6.9÷2.3,=8.4×(6.9÷2.3),=8.4×3,=25.2;⑤0.38×102,=0.38×(100+2),=0.38×100+0....

(1)4.05÷0.5+10.75=8.1+10.75=18.85(2)6.8×2.7+2.7×3.2=(6.8+3.2)×2.7=10×2.7=27(3)0.38×102=0.38×(100+2)=0.38×100+0.38×2=38+0.76=38.76(4)70.3-17.48÷7.6=70.3-2.3=68(5)0.125×0.6×80=0.125×80×0.6=10×0.6=6(6)8.5×1.2÷3.4=1...

(1)10.15-10.75×0.4-5.7,=10.15-4.3-5.7,=10.15-(4.3+5.7),=10.15-10,=0.15;(2)5.8×(3.87-0.13)+4.2×3.74,=5.8×3.74+4.2×3.74,=(5.8+4.2)×3.74,=10×3.74,=37.4;(3)32.52-(6+9.728)÷3.2×2.5,=32.52-15.728÷3.2×2.5,=3...

(1)69.4-5.185÷1.7-13.9×0.5,=69.4-3.05-6.95,=69.4-(3.05+6.95),=69.4-10,=59.4;(2)5×(115+217)×17=5×17×115+5×17×217;=173+10,=1523;(3)113+1213×(52-13),=113+1213×52-13×1213,=113+3013?413,=2713;(4)313×34+1013...

0.27x60.2+39.8x0.27 =0.27*(60.2+39.8)=0.27*100=27 2.5x1.2 =2.5*4*0.3=10*0.3=3 605÷5.5+10.6x27 =110+286.2=396.2 1.25*8.8=1.25*8+1.25*0.8=10+1=11

1

(1)0.125×5.46×8,=(0.125×8)×5.46,=1×5.46,=5.46;(2)2.5×3.2×125,=(2.5×4)×(0.8×125),=10×100,=1000;(3)4.9×101,=4.9×100+4.9×1,=490+4.9,=494.9;(4)4.5×12.6-3.6×4.5+4.5,=4.5×(12.6-3.6+1),=4.5×10,=45;(5...

(1)3.2×2.5×12.5,=4×0.8×2.5×12.5,=(4×2.5)×(0.8×12.5),=10×10,=100,(2)0.25÷(45+0.2)-14,=0.25÷1-14,=0.25-0.25,=0,(3)7÷〔411×(34+16)〕,=7÷[411×1112],=7÷13,=21,(4)5.7×0.25+6.8×25%-8.5×14,=5.7×0.25+6.8×0....

(1)1.29+3.7+0.71+6.3,=(1.29+0.71)+(3.7+6.3),=2+10,=12;(2)23.4-8.54-1.46,=23.4-(8.54+1.46),=23.4-10,=13.4;(3)6.75×0.5+4.86,=3.375+4.86,=8.235;(4)19×3.6-3.6×9,=3.6×(19-9),=3.6×10,=36;(5)2.5×1.8×0...

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