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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...

(1)[(5.1-3.6)÷0.8-1]×0.09=[1.5÷0.8-1]×0.09=[1.875-1]×0.09=0.875×0.09=0.07875(2)98.4×98+98.4×2=98.4×(98+2)=98.4×100=9840(3)30.1÷[(6.07+2.53)×0.7]=30.1÷[8.6×0.7]=30.1÷6.02=5(4)0.94×2.5+0.094×75=0.94×2.5+0.94×7.5=0.9...

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= ...

(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 ,...

(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.

(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×...

=48-3.6*1-3.6*0.7 =48-3.6-2.52 =41.88

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

(1)1.36+4.85+2.64+6.15,=(1.36+2.64)+(4.85+6.15),=4+11,=15;(2)98.5÷2.5÷4,=98.5÷(2.5×4),=98.5÷10,=9.85;(3)5.4÷[2.5×(3.7-2.9)],=5.4÷[2.5×0.8],=5.4÷2,=2.7;(4)0.8×(4-3.68)÷0.01,=0.8×0.32÷0.01,=0.256÷...

(1)7.8×9.8-14.5,=76.44-14.5,=61.94;(2)13.4+5.62+17.6+4.38,=(13.4+17.6)+(5.62+4.38),=31+10,=41;(3)3.6×42+4.2×64,=36×4.2+4.2×64,=4.2×(36+64),=4.2×100,=420;(4)4.8×12.5×0.8,=4.8×(12.5×0.8),=4.8×10,=48...

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