题目内容

3.3×2= 2.4×0.5= 0.6×0.9= 0.2×0.3=
0.39+0.61= 10-7.2= 0.88+1.1= 0.75×4=
11-1.5= 4.48-4= 7.8-0.8= 2.8×5=
4×0.3= 4×0.25= 3.2+1.6= 10.6-5.2=
0.32+1.68= 8×125= 7.28+7= 0.8+39.2=
43+0.01= 0.4×2= 1.5×6= 1×0.04=
1.53-0.5= 1.5-0.6= 0.3+1.5= 95÷5=
0.65+4.35= 14-7.4= 11.2-9.8= 4.4×2=
35-25= 56-26= 45+15= 35-15=
38+28= 15+25= 12+12= 47-27=
13+23= 1-12= 14+14= 212+312=
14-0= 610-510= 1-23= 0+56=
78-38= 29+29= 58-48= 15+45=
0.9×125×8= 5.75+1.37+4.25= 0.43×10+5.7= 62-2.8-1.2=
2.7×4+2.7×6= 0.25×0.5×4=
分析:这些题比较简单,有的直接口算得出,如3.3×2,43+0.01等;有的通过简算得出,如11-1.5=11-1-0.5=10-0.5=9.5,62-2.8-1.2=62-(2.8+1.2)=62-4=58,等.
解答:
解:3.3×2=6.6; 2.4×0.5=1.2; 0.6×0.9=0.54; 0.2×0.3=0.06;
0.39+0.61=1; 10-7.2=2.8; 0.88+1.1=1.98; 0.75×4=3;
11-1.5=9.5; 4.48-4=0.48; 7.8-0.8=7; 2.8×5=14;
4×0.3=1.2; 4×0.25=1; 3.2+1.6=4.8; 10.6-5.2=5.4;
0.32+1.68=2; 8×125=1000; 7.28+7=14.28; 0.8+39.2=40;
43+0.01=43.01; 0.4×2=0.8; 1.5×6=9; 1×0.04=0.04;
1.53-0.5=1.03 1.5-0.6=0.9; 0.3+1.5=1.8; 95÷5=19;
0.65+4.35=5; 14-7.4=6.6; 11.2-9.8=1.4; 4.4×2=8.8;
35-25=10; 56-26=30; 45+15=60; 35-15=20;
38+28=66; 15+25=40; 12+12=24; 47-27=20;
13+23=36; 1-12=-11; 14+14=28; 212+312=524;
14-0=14; 610-510=100; 1-23=-22; 0+56=56;
78-38=40; 29+29=58; 58-48=10; 15+45=60;
0.9×125×8=900; 5.75+1.37+4.25=11.37; 0.43×10+5.7=10; 62-2.8-1.2=58.
2.7×4+2.7×6=27; 0.25×0.5×4=0.5;
点评:此题主要考查学生的口算能力,以及运用运算定律进行简单口算的能力.
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2÷5=4.5+5=0.3÷0.6=0.96÷0.2=
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0.61+0.39=0.56÷28=10÷20=4.08÷0.4=
11-9.4=0.8×0.11=0.72+12.8=5.6÷0.01=
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