300x25用简便方法计算
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23+215+235+263+299=1−13+13−15+15−17+17−19+19−111=1−111=1011.
再答:OK
120x25/119=(119+1)x25/119=119x25/119+25/119=25+25/119=25又25/119
原式=120+55×12=120+55×2×6=120+110×6=120+660=780
(0.75x42.6-0.574x25+57.4)/3=(0.75x42.6-57.4x0.25+57.4x1)/3=(0.75x42.6+57.4x1-57.4x0.25)/3=[0.75x42.6
0.25x4=10.25的99次方x4的100次方=41/2的300次方看成1/8的100次方8的100次方x1/2的300次方=1所以=4-1=3
(o.75x42.6—o.574x25+57.4)÷3=(o.75x42.6+(—57.4x0.25+57.4))÷3=0.75x(42.6+57.4)÷3=0.25x100=25
解题思路:由平方差,可求。解题过程:varSWOC={};SWOC.tip=false;try{SWOCX2.OpenFile("http://dayi.prcedu.com/include/read
解题思路:发现规律解答解题过程:varSWOC={};SWOC.tip=false;try{SWOCX2.OpenFile("http://dayi.prcedu.com/include/readq.
(5.8X0.4+7.5X0.4)X2.5=(5.8+7.5)X0.4X2.5=(12+1.3)X4X0.25=13.3X1=13.31.6X(1.25+0.5)=16X0.125+1.6X0.5=2
132X88+157X12=132X100-132X12+157X12=13200+(157-132)*12=13200+(25*12)=13200+(25*10+25*2)=13200+300=13
(1)25×1.25×32,=(25×4)×(1.25×8),=100×10,=1000;(2)(3.75+4.1+2.15)×9.8,=10×9.8,=98;(3)5400-2940÷28×27,=
302x25=(300+2)x25=300x25+2x25=7500+50=7550
(17/42)x29+(29/42)x25=(29/42)x17+(29/42)x25=(29/42)x(17+25)=(29/42)x42=29
①7/13×25+7/13=7/13×(25+1)=14②14/15-5/16+11/15=14/15+11/15-5/16=25/15-5/16=5/3-5/16=65/48③2/29×(15×29
4×4×25=40099×(99+1)=99×100=9900再答:(100+2)×25=100×25+2×25=2550再答:(20×5)×273=100×273=27300再答:(100-2)×3
(8-0.8)x25=8x25-0.8x25=200-20=180
25%X+3=三分之二x60.25X=4-30.25X=1X=1÷0.25X=4五分之九x25%+2.2—0.25=1.8×0.25-0.25+2.2=(1.8-1)×0.25+2.2=0.8×0.2