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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...

(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)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...

(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

(1)7.6+7.6=15.2;(2)0.09+0.6+5.91+3.4,=0.09+5.91+0.6+3.4,=(0.09+5.91)+(0.6+3.4),=6+4,=10;(3)1.3×101,=1.3×(100+1),=1.3×100+1.3,=1300+1.3,=1301.3;(4)32×1.25×2.5,=8×4×1.25×2.5,=8×1.25×4×2.5,=(8×1.25)×...

100-10-10-10-10+0.1+0.2+0.3+0.4=61 求采纳

①3871-(1080-740)×7,=3871-340×7,=3871-2380,=1491;②5175÷207+102×9,=25+918,=943; ③0.9+1.08+0.92+0.1,=(0.9+0.1)+(1.08+0.92),=1+2,=3;④13.59-6.91-0.09,=13.59-(6.91+0.09)=13.59-7,=6.59; ⑤983×(3.8+2.2)+0.237×10...

(1)13.6-1.8-3.2=13.6-(1.8+3.2)=13.6-5=8.6(2)13.7+1.98+0.02+5.3=(13.7+5.3)+(1.98+0.02)=19+2=21(3)5.1+0.9-5.1+0.9=(5.1-5.1)+(0.9+0.9)=0+1.8=1.8(4)36×99=36×(100-1)=36×100-36=3600-36=3564(5)10.75+0.4+0.25=10.7...

(1)4×0.8×2.5×1.25,=(4×2.5)×(0.8×1.25),=10×1,=10;(2)[(79+13)÷815]×310,=[109×158]×310,=109×158×310,=58;(3)1-(712-12)×3,=1-112×3,=1-14,=34;(4)98+99×98,=(1+99)×98,=100×98,=9800;(5)(229+1110)×91...

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