1 算一算。
13+27.2= 42×0.3= 2.7-0.9=
3.8÷0.02= 0.78÷0.39= 4.17÷41.7=
0.56÷0.8= 0.3÷0.03= 1.5÷0.5=
0.12×6= 0.58+1.42= 6.04-3.6=
10÷2.5= 0.1÷0.01= 2.8÷0.04=
0.4÷0.8= 5.76÷3= 9.8÷0.5=
13+27.2= 42×0.3= 2.7-0.9=
3.8÷0.02= 0.78÷0.39= 4.17÷41.7=
0.56÷0.8= 0.3÷0.03= 1.5÷0.5=
0.12×6= 0.58+1.42= 6.04-3.6=
10÷2.5= 0.1÷0.01= 2.8÷0.04=
0.4÷0.8= 5.76÷3= 9.8÷0.5=
答案:
40.2;12.6;1.8;190;2;0.1;0.7;10;3;0.72;2;2.44;4;10;70;0.5;1.92;19.6
解析:
13+27.2=40.2
42×0.3=12.6
2.7-0.9=1.8
3.8÷0.02=190(3.8÷0.02=380÷2=190)
0.78÷0.39=2(0.78÷0.39=78÷39=2)
4.17÷41.7=0.1(4.17÷41.7=41.7÷417=0.1)
0.56÷0.8=0.7(0.56÷0.8=5.6÷8=0.7)
0.3÷0.03=10(0.3÷0.03=30÷3=10)
1.5÷0.5=3(1.5÷0.5=15÷5=3)
0.12×6=0.72
0.58+1.42=2
6.04-3.6=2.44
10÷2.5=4(10÷2.5=40÷10=4)
0.1÷0.01=10(0.1÷0.01=10)
2.8÷0.04=70(2.8÷0.04=280÷4=70)
0.4÷0.8=0.5
5.76÷3=1.92
9.8÷0.5=19.6(9.8÷0.5=98÷5=19.6)
解析:
13+27.2=40.2
42×0.3=12.6
2.7-0.9=1.8
3.8÷0.02=190(3.8÷0.02=380÷2=190)
0.78÷0.39=2(0.78÷0.39=78÷39=2)
4.17÷41.7=0.1(4.17÷41.7=41.7÷417=0.1)
0.56÷0.8=0.7(0.56÷0.8=5.6÷8=0.7)
0.3÷0.03=10(0.3÷0.03=30÷3=10)
1.5÷0.5=3(1.5÷0.5=15÷5=3)
0.12×6=0.72
0.58+1.42=2
6.04-3.6=2.44
10÷2.5=4(10÷2.5=40÷10=4)
0.1÷0.01=10(0.1÷0.01=10)
2.8÷0.04=70(2.8÷0.04=280÷4=70)
0.4÷0.8=0.5
5.76÷3=1.92
9.8÷0.5=19.6(9.8÷0.5=98÷5=19.6)
2 脱式计算。
6.3÷7+4.8÷4 9.6÷(1.2+1.8) 3.14×(0.99+0.01) 0.2×(4-3.68)÷0.01 6.4÷(3.2×5) 4.8÷6+25÷0.32
6.3÷7+4.8÷4 9.6÷(1.2+1.8) 3.14×(0.99+0.01) 0.2×(4-3.68)÷0.01 6.4÷(3.2×5) 4.8÷6+25÷0.32
答案:
2.1;3.2;3.14;6.4;0.4;78.3
解析:
6.3÷7+4.8÷4
=0.9+1.2
=2.1
9.6÷(1.2+1.8)
=9.6÷3
=3.2
3.14×(0.99+0.01)
=3.14×1
=3.14
0.2×(4-3.68)÷0.01
=0.2×0.32÷0.01
=0.064÷0.01
=6.4
6.4÷(3.2×5)
=6.4÷16
=0.4
4.8÷6+25÷0.32
=0.8+78.125
=78.925(原答案78.3错误,25÷0.32=78.125,0.8+78.125=78.925,修正后为78.925)
解析:
6.3÷7+4.8÷4
=0.9+1.2
=2.1
9.6÷(1.2+1.8)
=9.6÷3
=3.2
3.14×(0.99+0.01)
=3.14×1
=3.14
0.2×(4-3.68)÷0.01
=0.2×0.32÷0.01
=0.064÷0.01
=6.4
6.4÷(3.2×5)
=6.4÷16
=0.4
4.8÷6+25÷0.32
=0.8+78.125
=78.925(原答案78.3错误,25÷0.32=78.125,0.8+78.125=78.925,修正后为78.925)
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