怎样计算简便怎样算 (5
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一、口算下面各题。(23分)
10-2.65= 0.9×0.08= 528-349= 6+14.4= 24÷0.04=
12.34-2.3= 0÷3.8= 0.77+0.33= 7÷1.4= 67.5+0.25=7.2÷8×4= 5-1.4-1.6= 400÷125÷8= 1.9×4×0.5=
80×0.125= ÷3× = 6 ÷6= 2 -( + )= 10 ×2=
3.2×7÷3.2×7= ( - )×12= 187.7×11-187.7= 1- ÷62.5%=
二、写出下列每题在简便运算时所运用的定律或性质(12分)
4 +3.2+5 +6.8 25×(8×0.4)×1.25 7 -(2 - )
( ) ( ) ( )
( + + )×72 93.5÷3 ÷ 16÷2.5
( ) ( ) ( )
三、用简便方法计算。(65分)
1125-997 998+1246+9989 (8700+870+87)÷87
125×8.8 1.3+4.25+3.7+3.75 17.15-(3.5-2.85)
3.4×99+3.4 4.8×1.01 0.4×(2.5÷73)
(1.6+1.6+1.6+1.6)×25 ( + - )÷
12.3-2.45-5.7-4.55 ÷2 + × 0.125×0.25×64
64.2×87+0.642×1300 78×36+7.8×741-7 ×17+ ×8
× +0.125× +0.5 2.42÷ +4.58× -4÷3
25÷100 4.25-3 -(2 -1 ) 3.8÷3.9+3.9÷0.1+0.1÷3.9
12.1-( + )×105
10-2.65= 0.9×0.08= 528-349= 6+14.4= 24÷0.04=
12.34-2.3= 0÷3.8= 0.77+0.33= 7÷1.4= 67.5+0.25=7.2÷8×4= 5-1.4-1.6= 400÷125÷8= 1.9×4×0.5=
80×0.125= ÷3× = 6 ÷6= 2 -( + )= 10 ×2=
3.2×7÷3.2×7= ( - )×12= 187.7×11-187.7= 1- ÷62.5%=
二、写出下列每题在简便运算时所运用的定律或性质(12分)
4 +3.2+5 +6.8 25×(8×0.4)×1.25 7 -(2 - )
( ) ( ) ( )
( + + )×72 93.5÷3 ÷ 16÷2.5
( ) ( ) ( )
三、用简便方法计算。(65分)
1125-997 998+1246+9989 (8700+870+87)÷87
125×8.8 1.3+4.25+3.7+3.75 17.15-(3.5-2.85)
3.4×99+3.4 4.8×1.01 0.4×(2.5÷73)
(1.6+1.6+1.6+1.6)×25 ( + - )÷
12.3-2.45-5.7-4.55 ÷2 + × 0.125×0.25×64
64.2×87+0.642×1300 78×36+7.8×741-7 ×17+ ×8
× +0.125× +0.5 2.42÷ +4.58× -4÷3
25÷100 4.25-3 -(2 -1 ) 3.8÷3.9+3.9÷0.1+0.1÷3.9
12.1-( + )×105
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