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用简便方法计算题

(1)=12.54+(3.66+6.34)=12.54+10=22.54 (2)=8.37-7+0.26+2.26=1.37+2.52=3.89 (3)=5.93-1.93+2.86=4+2.86=6.86 (4)=18.2-(6.54+1.46)=18.2-8=10.2 (5)=19.6-9.6-5.9=10-5.9=4.1 (6)=12.94-(3.68+6.32)=12.94-10=2.94 (7)=20.18-10.18+9.39=10+9.

5.6*2.9 3.77*1.8 0.02*96 5.22*0.3 9.99*0.02 5*2.44 1.666*6.19.432*0.00 5.6*6.5 4.88*2.9 5.61*4.3 8.9*2.4 5.5*55 9.77*0.02 1.384*5.1 8.78*83 2.6*6 0.059*0.2 4.268*1.7 57*5.7 9.46*2.85 17.8*6.4 1.5*4.9 2.5*0.88 5.555*5.2 2.22*3.33 7.

(1)101*99=(100+1)*99=100*99+99=9999(2)14*35=7*2*35=7*70=490(3)25*28=25*4*7=100*7=700(4)4*9*25=4*25*9=100*9=900(5)43*5*4=43*20=860(6)15*12=15*2*6=30*6=180(7)12*(40-5)=12*40-12*5=480-60=420(8)64*9-14*9=(64-

第一组:158+262+138 375+219+381+225 5001-247-1021-232378+44+114+242+222 276+228+353+219(375+1034)+(966+125) (2130+783+270)+1017 99+999+9999+999997755-(2187+755) 2214+638+286 3065-738-10652357-183-317-357

9÷0.125=9÷1/8=9x8=72;25.25x0.65x4÷0.65=25.25x4x(0.65÷0.65)=(25x4+0.25x4)x1=101x1=101;0.485x102-48.5=0.485x(100+2)-48.5=48.5+0.97-48.5=0.97;4.4+4.4x12+13x5.6=4.4x(1+12)+13x5.6=4.4x13+13x5.6=(4.4+5.6)x13=10x13=130.

1+1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90 =1+1/2+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)+(1/7-1/8)+(1/8-1/9)+(1/9-1/10)=1+1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10 =2-1/10 =19/10

1、56+31+24=(56+24)+31=80+31=111,2、615+475+125 =615+(475+125)=615+600=12153、125*64 =125*8*8=1000*8=80004、 89+101+111=101+(89+111)=101+200=3015、24+127+476+573 =(24+476)+(127+573)=500+700=12006、

没题啊 一、判断. 1、78+25+22=78+22+25( )2、25*34*4=25*4*34 ()3、78*(20+5) +B-C=A-( )+( ) 三、怎样简便就怎样算.107+39+93+61 2182-1655-345 76*

1、7.74*(2.8-1.3)+1.5*2.26 =7.74x1.5+2.26x1.5 =(7.74+2.26)x1.5 =10x1.5=152、7.2*0.2+2.4*1.4 =2.4x0.6+2.4x1.4 =2.4x(0.6+1.4) =2.4x2=4.83、2.22*9.9+6.66*6.7 =6.66x3.3+6.66x6.7 =6.66x(3.3+6.7) =6.66x10=66.64、12.7*9.9+1.27 =1.27x99+1.27 =1.27x(99+1) =1.27x100=127

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