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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)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;...

2.8×7.6+1.4×2.8+2.8 =2.8×(7.6+1.4+1) =2.8×10 =28

原式=2.8*(7.6+1.4+1) =2.8*10 =28

原式=2.8x7.6+1.4x2.8+2.8x1 =2.8x(7.6+1.4+1) =2.8x10 =28

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0.36+0.64=16-1.5=4.50.96÷0.3=3.22.8+7.2=105×1.2=61.65×10=16.51.4×3=4.210-9.9=0.16.3+3.7=100.15×3=0.459.6÷6=1.64.3-0.5=3.89-2.4=6.60.25×4=115×0.2=30.96-0.6=0.362.4÷0.12=202.4÷0.8=30.1×0.1=0.010.06×1000=60

=7.8×(2.8÷1.4) =7.8X2 =15.6 很高兴为你解答有用请采纳

原式 =(7.6x2.8+1.4x4x1.9-2.8x1.4)÷2.5x4 =(7.6x2.8+1.4x7.6-2.8x1.4)÷2.5x4 =[7.6x(2.8+1.4)-2.8x1.4]÷2.5x4 =(7.6x4.2-2.8x1.4)÷2.5x4 =(7.6x3x1.4-2.8x1.4)÷2.5x4 =(22.8x1.4-2.8x1.4)÷2.5x4 =20x1.4÷2.5x4 =20÷2.5x1.4x4 =8x1.4x4 =11.2x4...

(1) 3.14x26.4+31.4x7.35+0.314 =3.14x26.4+3.14x73.5+3.14x0.1 =3.14x(26.4+73.5+0.1) =3.14x100 =314 (2) 2.8x9.6x3.4/(1.4x3.2x1.7) =1.4x2x3.2x3x1.7x2/(1.4x3.2x1.7) =2x3x2 =12

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