改琴计算Doc1

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1、一、直接写得数：6.9－2.5=7.2×0.8=6×3.4=0.62－0.32=1.4×0.5=0.75×100=0.02×0.5=3.6÷0.3=6.3÷7=5.6÷100=0.75÷0.25=0.125×8=4.8÷0.3=0.96÷2=0.56÷28=0.36÷0.4=0.64÷0.8=0.72÷3.6=4.8÷24=0.8×1.1=7.2+12.8=66.7－3.7=12.8÷4=5.2÷13=12.5÷5=1.64÷4=10÷20=24÷1.2=8.65×10=0.35×0.6=3.08×0.01=4.95×1000=166

2、.9×0.1=0.4×0.5=2.4÷0.8=10.8÷9=9.6÷0.8=0.108÷2=4.9÷0.7=9.65÷0.1=0.325×100=2.5×8=0.56÷0.7=0.125×4=3.28×0.1=3.9÷0.13=7.2×0.1=0.01×0.1=0.25×0.4=1.6÷0.8=1÷2.5=4÷0.5＝9.6÷16＝1÷0.01＝0.01÷1＝7.5÷5＝0.81÷9＝3÷0.5＝10÷25＝4.8÷0.16＝0÷3.89＝3.52÷1＝1.2-0.8=0.83-0.5=2.7×0.3=12.5×8=162.3×4=3

3、.25×0=0.4×50=30×0.1=2.6×3=4.1×2=0.35×0.2=7.5×0.1=2.5×2=0.5×10=0.6×8=2.8×10=0.7×0.8=5.6+0.4=4.7+2.3=4.5×2=7.2×0.8=6×3.4=0.62-0.32=0.75×100=0.02×0.5=3.6×0.3=5.6×100=0.75÷0.25=0.125×8=0.86÷2=0.56÷28=0.36÷0.4=0.7×9=3.6÷12=0.8×1.1=46.7-3.7=12.8÷4=5.2÷13=1.64+4.1=10÷20=1624÷1

4、.2=0.35×0.6=4.7+2.3=4.5×2=1-0.95=0.3+0.27=0.47+0.13=1.25×8=0.05×4=0.95+0.05=2.5×4=0.74+0.16=23×100=9.8-4.8=480÷40=0.53÷100=5.1+2.3=125×80=0.078÷10=0.52+0.4=70×12=0.25×100=3.4-2.8=0.6-0.37=0.052×10=10+0.08=1-0.75=0.5×1000=0.82+0.3=5.1÷0.17＝0.48÷0.8＝4.4÷11＝二、用竖式计算（1）2.5×3

5、.6（2）0.875×45(3)0.065×0.4516（4）3.14×25(5)3.14×36(6)3.14×16（7）5.98÷0.23（8）19.76÷5.2（9）10.8÷4.5（10）1.256÷3.14（11）78.5÷3.14（12）6.21÷0.3（13）2.5×3.6（14）0.875×45(15)0.065×0.45（16）3.14×25(17)3.14×36(18)3.14×1616（19）5.98÷0.23（20）19.76÷5.2（21）10.8÷4.5（22）1.256÷3.14（23）78.5÷3.14（

6、24）6.21÷0.3三、简便计算88＋56＋12  178＋350＋2256＋208＋144  （2.3＋5.6）＋4.7  286＋54＋46＋4   5.82＋4.56＋5.44  25×37×0.4   75×0.39×4   6.5×11×4      160.8×37×1.25  43×15×6  41×35×2136×4.06＋4.06×64  7.02×123＋877×7.02      102×5.6－5.6×2   471×0.25－0.25×71 43×126－86×13    101×99－8974.58－0.

7、45—0.55      23.4－4.56－5.44   6.47－4.57－1.434500÷0.4÷75 4500÷0.4÷75    16800÷8÷161.25    248000÷0.8÷125    5200÷4÷2.5++--+-（-）-（+）+四．解方程χ–60%χ=18χ+2.5×8=9540%χ+30=804χ+χ=916÷X=50%X+X=3.625%X+15%X=25X-15%X=686X＋5=13.44X－6＝384X－3×9=294X－6×5=20.36×5-X=X-0.8X=16+6162(X-2.6)

8、=8X-X=X×(+)=20X–8.5=1.5X-X-4=214+0.7X=102X-25%X=10五、简便运算。（-）×6036×0.65×101（1.25-0.125）×825×82.6×9913×10.20.92×