题目内容

(5.6-2.8×2)÷1.4=

A.
0
B.
4
C.
2.8
D.
5.6

A
解：(5.6-2.8×2)÷1.4
=(5.6-5.6)÷1.4
=0÷1.4
=0

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4.3-0.4=	7-6.2=	0.86-0.3=
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0.6÷0.5=	0.125×8=	0.38×1000=
6.8-1.7=	2.4×0.2=	32.8+19=
0.56÷14=	1÷0.05=	6÷12=
0.14×5=	3×1.4=	4.9÷0.7=
0.4÷8=	6.3+3.7=	3.5×0.2=
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0÷3.5×0.2=	0×9.7+2.3=	1.6×9+1.6=
3.8+1.2=	4.8÷0.3=	530+270=
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26.1-3.5-7.5=

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10-6=	5+2=	7+0=	6-2=
8-2=	5+5=	7-6=	10-5=
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2+7=	2+0=	8-2=	7-3=
4+5=	5-0=	10-3=	0+8=
8+0=	3+3=	10-7=	2+5=
9-1=	8+1=	8-5=	10-4=
1+9=	7-2=	4-2=	9-4=
6+4=	9-3=	4-4=	8-4=
7+2-4=	6+2-7=	10-8+2=	10-5-4=

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观察已知算式，寻找规律填空．
（1）1=1×2÷2
1+2=2×3÷2
1+2+3=3×4÷2
1+2+3+4=4×

（2）1×2=1×2×3÷3
1×2+2×3=2×3×4÷3
1×2+2×3+3×4=3×4×5÷

1×2+2×3+3×4+4×5=4×5×

1×2+2×3+3×4+4×5+5×6=

1×2+2×3+3×4+…+n×（n+1）=

（3）1×2×3=1×2×3×4÷4
1×2×3+2×3×4=2×3×4×5÷4
1×2×3+2×3×4+3×4×5=3×4×5×

÷4
1×2×3+2×3×4+3×4×5+4×5×6=

1×2×3+2×3×4+3×4×5+4×5×6+5×6×7=

1×2×3+2×3×4+…+n×（n+1）×（n+2）=

猜一猜：
1×2×3×4+2×3×4×5+3×4×5×6=

3×4×5×6×7÷5

3×4×5×6×7÷5

1.23÷3= 0.8×11= 1-0.75=
1.7×0.4= 0.36÷12= 1.6+0.38=
1.2÷0.3= 0.75×4= 15×0.4=
2.14-0.9= 4×0.25= 10÷2.5=
0.4×52= 1.6×0.4= 9.6÷6=
4.3-0.4= 7-6.2= 0.86-0.3=
8.8÷2.2= 2.6÷0.2= 0.15×3=
0.9÷0.45= 0.27÷3= 0.51+1.7=
0.6÷0.5= 0.125×8= 0.38×1000=
6.8-1.7= 2.4×0.2= 32.8+19=
0.56÷14= 1÷0.05= 6÷12=
0.14×5= 3×1.4= 4.9÷0.7=
0.4÷8= 6.3+3.7= 3.5×0.2=
0.2×12.6×5= 8.4÷4.2= 2.4×0.5=
0÷3.5×0.2= 0×9.7+2.3= 1.6×9+1.6=
3.8+1.2= 4.8÷0.3= 530+270=
7.6÷3.8= 92÷2.3= 9.6-1.6=
7.2+2.8= 2.63+0.37= 0.67+1.24=
0.3×101=
0.25×8=
16÷1.6=

26.1-3.5-7.5=