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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...

2.8×7.6+1.4×2.8+2.8 =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

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...

(1)12.6-0.84×5÷1.4,=12.6-4.2÷1.4,=12.6-3,=9.6;(2)2.8×0.25+7.2×0.25,=(2.8+7.2)×0.25,=10×0.25,=2.5;(3)7.24×[1÷(3.1-3.09)],=7.24×[1÷0.01],=7.24×100,=724;(4)0.18×(4.6-0.598÷0.46),=0.18×(4.6-1.3),=0.18×...

简算题50道口算300道脱式计算100道,五年级的哦!...172.1×4.3+5.7×2.1 19.102×45-328 2.8×...网友都在找: 五年级数学简算题 五年级简便运算 五...

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

e-004 就是乘以10^(-4),科学计数法。如e+05就是乘以10^5

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