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7.2 ÷1.8(3.4%2.9)用脱式计算

解:依题意得算式, 7.2÷1.8×(3.4-2.9) =4×0.5 =2 7.2÷1.8×(3.4-2.9)=2

7/9÷2/3+2/9 =7/9×3/2+2/9 =7/6+2/9 =21/18+4/18 =25/18

7.8-4.68÷3.9 =7.8-1.2 =6.6

直接用通分法即可: 原式=(3/8+1/4)+3/7-2/9 =(3+2)/8+3/7-2/9 =5/8+3/7-2/9 根据7,8,9最小公倍数是7×8×9=504 =(5×63+3×72-2×56)/504=419/504

3/4×(9/8)+0.75÷8/7+2÷(4/3) =3/4×(9/8)+3/4x7/8+2x3/4 =3/4x(9/8+7/8+2) =3/4x(2+2) =3/4x4 =3 谢谢,请采纳

(1)9.4÷[(1.2+1.3)÷0.25]=9.4÷[2.5÷0.25]=9.4÷10=0.94(2)(1.2+1.8×4)×(7-6.75=(1.2+7.2)×0.25=8.4×0.25=2.1(3)2.65×1.7+13.5×0.17=2.65×1.7+1.35×1.7=(2.65+1.35)×1.7=4×1.7=6.8(4)20.4-0.8×0.4-0.68=20.4-0.32-0.68=20.4-(0....

5.4÷(2.04+3.94) =5.4÷5.98 =0.903

(1)100-91÷13,=100-7,=93;(2)(100-91)÷13,=9÷13,=913;(3)7.73-2.3÷0.5×0.8,=7.73-4.6×0.8,=7.73-3.68,=4.05;(4)(1-45×35)÷925,=(1-1225)÷925,=1325÷925,=139;(5)34÷[(23-16)÷5],=34÷[12÷5],=34÷110,=152.

2012年1月28日星期六一、口算题小数加法:0.3+1.5=2.5+9.8=7.6+1.3=4.4+5.7=2.3+7.7=5.7+3.1=7.69+2.31=9.16+2.64=5.68+12.22=16.8+16.5=小数减法:6.8-3.8=4.26-3.71=0.88-2.12=5.34-69.21=68.4-61.5=9.58-3.7=18.94-5.66=15.69-9.78=115-68.59...

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