望采纳谢谢.(1)2.5*32*0.125 =(2.5*4)*(8*0.125) =10*1 =10 (2)3.5-7+6.5 =3.5+6.5-7 =3 (3)1.2*2.5+0.8*2.5 =2.5(1.2+0.8) =25 (4)8.9*1.25-0.9*1.25 =1.25(8.9-0.9) =10 (5)12.5*7.4*0.8 =12.5*0.8*7.4 =74 (6)6.5*9.5+6.5*0.5 =6.5*(9.5+0.5) =6.5*10
简便计算题:1)6.9+4.8+3.1 0.456+6.22+3.78 2)4.02+5.4+0.98 5.17-1.8-3.2 13.75-(3.756.48) 3)3.68+7.56-2.68 7.85+2.34-0.85+4.66 35.6-1.8-15.6-7.2 4)3.82+2.9+0.18+9.1 9.6+4.8-3.6 7.14-0.53-2.47 5)5.27+2.86-0.66+1.63 13.35-4.68+2.65 6)
一、口算下面各题10-2.65= 0.9*0.08= 528-349= 6+14.4= 24÷0.04= 12.34-2.3= 0÷3.8= 0.77+0.33= 7÷1.4= 67.5+0.25=7.2÷8*4= 5-1.4-1.6= 00÷125÷8= 1.9*4*0.5=80*0.125= 3* = 6 6= 2 -( + )= 10 2= 3.2*7÷3.2*7= ( - )*12= 187.7*11-187.7= 1- 62.5
一、计算:1、竖式计算(得数精确到百分位)8.63*0.42 0.38*2.62、脱式计算(能简算的要简算)0.125*0.25*8*47.4*0.28+0.28*2.64.8*0.9+0.48 (4-0.4)*2.53、列竖式计算 4.83÷3 36.8÷16 5
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、
1) 311*8-8-8*112= 2) 98*100+197*98= 3) 6*3+6+194*6= 4) 12*15+12+182*12= 5) 304*10-10-10*105= 6) 17*180+17+17*17= 7) 85*82+17*85= 8) 336*20-20-20*137=
1.45+15*6= 135 2.250÷5*8=400 3.6*5÷2*4=60 4.30*3+8=98 5.400÷4+20*5= 200 6.10+12÷3+20=34 7.(80÷20+80)÷4=21 8.70+(100-10*5)=120 9.360÷40+10= 19 10.40*20-200= 600 11.(80-25)*2= 110 12.70+45=115 13.90*2÷3= 60 14.16*6÷3=