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用简便方法计算下面各题(1)7.8÷[32×(1X)+3.6...

(1)7.8÷[32×(1-58)+3.6]=7.8÷[32×38+3.6]=7.8÷[12+3.6]=7.8÷15.6=0.5;(2)20513-2.73-8.27+1713=(20513+1713)-(2.73+8.27)=22-11=11;(3)15×(115+117)×17=15×115×17+15×117×17=17+15=32;(4)4.3×1.8+86×0.91=43×0.18+43×2×0.91=43...

除法那部分先提取公因式 (8.1-5.4)÷3.6 = (0.9 x 9 - 0.9 x 6)÷ (0.9 x 4)= 0.9 x (9 - 6) ÷ (0.9 x 4)= 0.9 x (9 - 6) ÷ 0.9 ÷ 4= (9 - 6) ÷ 4= 0.75 (8.1-5.4)÷3.6+85.7= 0.75 + 85.7= 85 + 0.7 + 0.75= 85 + (0.7 + 0.75)= 85 + 1.45= ...

=3.6除以(10+0.1)= 3.6×10+0.1×3.6=36+0.36=36.36

(1)32.5+3.6×2.5÷0.48,=32.5+9÷0.48,=32.5+18.75,=51.25;(2)22- 3 4 × 1 2 - 5 8 ,=22- 3 8 - 5 8 ,=22-( 3 8 + 5 8 ),=22-1,=21;(3)299÷(299+ 299 300 ),=299÷ 299×300+299 300 ,=299× 300 299×300+299 ,= 300 300+1 ,...

(10-7.5)×3.6 =2.5×3.6 =2.5×(4×0.9) =2.5×4×0.9 =10×0.9 =9

4.5x3.6+5.4x3.6 =(4.5+5.4)x3.6 =(10-1)x3.6 =10x3.6-3.6 =36-3.6 =32.4

(1)22.7×1.25×O.8,=22.7×(1.25×O.8),=22.7×1,=22.7;(2)3.91×2.8+6.09×2.8,=(3.91+6.09)×2.8,=10×2.8,=28;(3)9.83×(3.8-2.3)+1.5×6.17,=9.83×1.5+1.5×6.17,=(9.83+6.17)×1.5,=16×1.5,=24;(4)3.6×51+36×4.9,=3.6×51...

(1)293+720÷45×12,=293+16×12,=293+192,=485;(2)14÷(3-513-813),=14÷[3-(513+813)],=14÷[3-1],=14÷2,=18;(3)8.2-(3.6+6.8)÷26,=8.2-10.4÷26,=8.2-0.4,=7.8;(4)(0.75-316)×(29+13),=(34-316)×(29+13),=916×...

(1)8.54÷2.5÷0.4=8.54÷(2.5×0.4)=8.54÷1=8.54;(2)(9.37+9.37+9.37+9.37)×2.5=9.37×4×2.5=9.37×(4×2.5)=9.37×10=93.7;(3)3.6×10.1-0.36=3.6×10.1-3.6×0.1=3.6×(10.1-0.1)=3.6×10=36;(4)2.22×9.9+6.66×6.7=2.22×3×3.3+6.66×6.7...

(1)9.6-11÷7+17×4=9.6-117+47=9.6-(117-47)=9.6-1=8.6;(2)318×7.4-318+3.6×3.125=3.125×7.4-3.125+3.6×3.125=3.125×(7.4-1+3.6)=3.125×10=31.25.

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