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能用用简便方法计算的就用简便方法2.8×7.6+1.4×2.8...

(1)2.8×7.6+1.4×2.8+2.8 =2.8×(7.6+1.4+1)=2.8×10=28(2)4.5×1.2-3.15÷15=5.4-0.21=5.19(3)[12.8-(7.5+4.5)]×2.5=[12.8-12]×2.5=0.8×2.5=2(4)0.65+2.7+0.35+7.3 =(0.65+0.35)+(2.7+7.3)=1+10=11(5)3.8×0.56+0.56×6.2=(3.8+6.2...

(1)2.8×7.6+1.4×2.8+2.8=2.8×(7.6+1.4+1)=2.8×10=28;(2)70.8-0.8×0.5=70.8-0.4=70.4;(3)13-3.79-6.21=13-(3.79+6.21)=13-10=3;(4)5×(40+0.7)=5×40+5×0.7=200+3.5=203.5;(5)4.12-1.78-1.22=4.12-(1.78+1.22)=4.12-3=1.12;...

原式=2.8*(7.6+1.4+1) =2.8*10 =28

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1、用竖式计算 0.396÷1.2= 0.756÷0.36= 15.6×13= 0.18×15= 0.025×14= 3.06×36= 0.04×0.12= 3.84×2.6≈ 5.76×3= (保留一位小数) 7.15×22 90.75÷3.3 3.68×0.25 16.9÷0.13 1.55÷3.9 3.7×0.016 13.76×0.8= 5.2×0.6 8.4×1.3 6.4×0.5 4.48×0.4 5.25...

5.3×6.3+2.3= 4.4×7.3+5.3= 4×8.8+1.5= 4.1×0.8-0.2= 9.9×1.4+0.6= 6.4×2.4+3.6= 12.48-4×9.7= 9.8×1.3-0.3= 4.8×9.1-0.5= 4.2×1.8-0.1= 5.59-3×4.3= 3.053-0.1×5.3= 9.4×8.4+5.8= 6.908-1.3×1.6= 13.596-9.1×5.6= 11.259-2.1×7.9= 7.3+3.8×2.3=...

一、脱式计算 2.5×7.1×4 16.12×99+16.12 5.2×0.9+0.9 7.28×99+7.28 4.3×50×0.2 60-2.68×0.5 26×15.7+15.7×24 (2.275 +0.625)×0.28 3.94+34.3×0.2 1.2×(9.6÷2.4)÷4.8 9×1.1×4.7 2.7×5.4×3.9 3.6×9.85-5.46 8.05×3.4+7.6 6.58×4.5×0.9 2.8×0....

2.37*6.3/2.37*3.7 =(6.3/3.7)*(2.37/2.37) =6.3/3.7 =63/37 2.5*1.25*0.32 =2.5*1.25*0.4*0.8 =2.5*0.4*(1.25*0.8) =1*1 =1 3.8*10.1 =3.8*(10+0.1) =3.8*10+3.8*0.1 =38+0.38 =38.38 2.4*0.8-4.48/2.8 =2.4*0.8-1.6 =(2+0.4)*0.8-1.6 =2*0.8+0...

你好,以下为题。 1.2+1.5=2.7 1.3+1.5=2.8 0.2+1.2=1.4 1.3+1.08=2.38 5.5+2.1=7.6 7.8+1.9=9.7 1.02+1.03=2.05 1.2+1.5=2.7 1.5+1.7=3.2 1.3+1.5=2.8 0.2+1.2=1.4 1.3+1.08=2.38 5.5+2.1=7.6 7.8+1.9=9.7 1.02+1.03=2.05 1.2+1.5=2.7 1.3+1.5=...

(1)24x-8x=28.8 16x=28.8 16x÷16=28.8÷16 x=1.8;(2)4.5x+1.6x=42.7 6.1x=42.7 6.1x÷6.1=42.7÷6.1 x=7;(3)(7-1.4)x=2.8 5.6x=2.8 5.6x÷5.6=2.8÷5.6 x=0.5;(4)9x-5.2×6=4.8 9x-31.2=4.89x-31.2+31.2=4.8+31.2 9x=36 9x÷9=36÷9 x=4;...

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