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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)21.6÷0.8-1.2×5=27-6=21(3)6.8×2.7+2.7×3.2=(6.8+3.2)×2.7=10×2.7=27(4)8.4×6.9÷(6.44-4.14)=8.4×6.9÷2.3=8.4×(6.9÷2.3)=8.4×3=25.2(5)0.38×102 =0.38×(100+2)=0.38×100+0.38×2 =38+0.76...

(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)23.4-5.7-4.3, =23.4-(5.7+4.3), =23.4-10, =13.4; (2)(467+36×3)÷23, =(467+108)÷23, =575÷23, =25; (3)25×50×4×6, =(25×4)×(50×6), =100×300, =30000; (4)46×16+16×54, =(46+54)×16, =100×16, =1600; ...

(1)4.45+0.63+5.55=(4.45+5.55)+0.63=10+0.63=10.63(2)7.33+6.84-3.84+2.77=7.33+2.77+(6.84-3.84)=10.1+3=13.1(3)6.58-(2.58+0.9)=6.58-2.58-0.9=4-0.9=3.1(4)1.29+3.7+2.71+6.3=(1.29+2.71)+(6.3+3.7)=4+10=14

(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)×...

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)40.5÷0.5+10.75,=81+10.75,=91.75;(2)213.6÷0.8÷0.3,=267÷0.3,=890;(3)39.22÷3.7×2.5,=10.6×2.5,=26.5;(4)1.25×2.5×32,=(1.25×8)×(2.5×4),=10×10,=100;(5)0.24×103,=0.24×100+0.24×3,=24+0.72,=24.72;(6)13...

(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...

(1)9.7-3.79+1.3-6.21,=9.7+1.3-(3.79+6.21),=11-10,=1;(2)280-49-156,=280-(49+156),=280-205,=75;(3)(4.8-2.8÷2)×0.5,=(4.8-1.4)×0.5,=3.4×0.5,=1.7;(4)32×12.5×0.25,=(8×12.5)×(4×0.25),=100×1,=100;(5...

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