题目内容

口算
8×0.4=		 0.1-0.01= 1÷0.25= 2.5+0.6=
0.12×0= 0.63÷0.9= 5.2+3.8= 5-0.64=
8.7-0.55-0.45= 1÷0.125÷8=
分析：根据小数四则运算的方法进行依次口算即可．
解答：解：8×0.4=3.2            0.1-0.01=0.09              1÷0.25=4              2.5+0.6=3.1，
  0.12×0=0               0.63÷0.9=0.7              5.2+3.8=9              5-0.64=4.36，
 8.7-0.55-0.45=7.7        1÷0.125÷8=1．
点评：此题较简单，属于简单的小数口算题，做此类题的关键要认真，看准运算符号和数字．
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口算．
0.4×0.25=		 3.2÷0.8= 1.25×7×0.8= 1÷8=
0.2×0.9+0.6×0.2= 6.2÷0.62= 2-2÷5= 1-0.08=
0.5×0.1÷0.5×0.1= 0.01÷0.001×0.1=
口算
9.5×100=		 1.25×8 0.25×0.9×4= 1.87×0=
3.5-1.5= 1.2×0.4= 3.6×0.5= 0.6×5=
0.24+0.6= 0.64×0.03= 7.8+2.2-1.5= 8×0.05=
0.125×8= 1.3×4= 0.4×0.6= 3×0.08=
0.35×2= 2.9×0.3= 10-0.9= 5.67×0=
0.8×0.01= 2.5×0.2= 2.4×0.3= 1.6×0.25=
0.17×0.3= 15×0.01= 10×0.07= 0.7×0.05=
0.2×0.05= 7.8×0.01= 0.2×0.26= 0.04×4=
12.4+2.1= 0.08×0.5= 0.14×4= 9×2.5+9×1.5=
1.8×0.5= 2.3×5= 0.3×3.6= 8×0.9+8×2.1=
2.5×4= 0.8+2.7×2= 0.05×7= 4.8+2.1+7.9=
3.4-1.8= 2.5+0.2×2= 0.02×0.1= 5.4-2.8=
0.3×0.2= 3.5×2×0.1= 0.3×0.3= 0×10.3×2.2=
0.12×0.7= 0.2×0.5= 0.92×0.4= 6.7-1.43=
1.2×4= 1.3×2= 1.2×0.3= 4.6+5.08=
口算．
0.4×3=		 4.35×100= 3.5x+x= 0.72÷0.9= 9.85×0=
40×0.1= 32x-4x= 7.2÷6= 0.25×4= 1×0.05=
17a-5a= 7.82÷1= 0.125×8= 99×3.2+6.8= a-0.2a=
0.34÷0.17= 4.3×2= 5.4×3.7+4.6×3.7= 26÷1.3= 30.4÷4=

口算
8×0.4=		0.1-0.01=1÷0.25=2.5+0.6=
0.12×0=0.63÷0.9=5.2+3.8=5-0.64=
8.7-0.55-0.45=1÷0.125÷8=

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