3 运动定律与简便运算
递等式计算.(能用简便算法的用简便方法计算)
1.5×105 2.33×0.5×4 24.6+18.7+15.4
1.2×2.5+0.8×2.5 2.05÷0.82+33.6 9.07﹣22.78÷3.4.
①1.25×0.25×0.8×4 ②29.8﹣(9.8+2.99÷2.3)
③(
﹣15.3)×
×2.4 ④1.75×0.25+0.25×6.25
⑤(
+
)×8+
.
计算:
①3.2×1.25×0.25 ②5.8×[1÷(2.1﹣2.09)]
③3150×101﹣3150 ④42÷(12+23 )
⑤34×78+18×75% ⑥(78﹣516)×(59+23)
用递等式计算(能简算的要用简便方法计算).
4.32+3.2+5.68 79×101﹣79 132+25×8
20﹣
×5 (0.125×8﹣0.5)×4 (0.25+
)÷(
﹣
)
能简算的要简算,写出简算过程.
8×4×12.5×0.25 0.7+3.9+4.3+6.1 646+785﹣146 2.7×4.8+2.7×5.2 12.5×64.
选用恰当的方法计算下面各题.
①12.5×8.8÷11 ②4.6×38.7+4.6×61+4.6×0.3
③0.125×0.25×32 ④1.7÷〔6.6﹣28.8÷9)〕
脱式计算(能简算的要简算)
5+0.45÷0.9﹣1.75 75.36﹣24.9+24.64﹣25.1
71×40%+28×
+0.4 1÷〔(
+0.25)×0.125﹣
〕
计算下面各题,能简算的要写出简算过程
1.8×(4.7﹣3.87÷0.9) 7.28﹣3.14+1.72﹣2.86
4×0.8×2.5×12.5 0.65×14+87×65%﹣65%
0.5×1.6+0.5×26.4 7.16﹣(3.5﹣3.84) (0.125×8﹣0.5)÷0.25
﹣(
+
) 999×778+333×666 (13×0.58﹣4.87+0.42×13﹣5.13)×4.25.
能简算的要简算
40%×
+60%×
20%×
﹣20%×
×35%+0.25×65%
75%×125﹣75%×25 (
+
)×45 15×40%+85×40%
计算下面各题.(能简算的要简算)
(1)24×
+76×
(2)87.5÷12.5÷8 (3)
(4)91+91×
(5)2.2×101 (6)14.6﹣3.625﹣6.375.
脱式计算.
8.82×15﹣100 15.8﹣
+14.2﹣
21.6﹣0.8×4÷0.8×4
3
×3.7+3.6+5.3×3
2.5×4.4 (1.5+2
)÷3.75﹣
.
直接写出得数
(1)547+765﹣147= (2)9.3÷0.03= (3)9﹣
﹣
= (4)
×
÷5= (5)(a﹣3)×0=
(6)12×(
﹣
)= (7)
÷2÷
= (8)
= (9)4.8×2.7+5.2×2.7= (10)
÷(
+
)×8=
直接写出得数
(1)
= (2)4.22+0.4+0.38= (3)6.55﹣1.5= (4)
×
= (5)0.72÷0.8=
(6)1+
= (7)12.5×6×8= (8)33= (9)75×25%+25×25%= (10)5×(
)×8=





+
)×12+
×0.75+
×
(
+40%)×
﹣
69.4﹣5.185÷1.7﹣13.9×0.5.
+
﹣
)
×(
×17﹣
﹣
)×(
+
)
÷7+
×
.
÷8+
×

)×3]
×[
+(
﹣0.25)].
×[1÷(
+
)],
÷
÷
+
) 2÷
﹣
×(
﹣
÷
)
÷〔
﹣(
+
)〕
+
﹣10%)×21
×53%+60%×0.47 2
﹣(20%+
)×4.5.
=
=
=
=
=
=
= 1.2﹣1.2×
=
=
=
×2.4+3
÷
﹣2.4
+1÷3
×3
)÷3.5﹣0.01.
=
=
=
=
= 3.7×101=
)÷
×5% 32×1.25×0.25
×101﹣
5.8×[1÷(2.1﹣2.09)].


.
+3.9+5
+6.1
×
+
×
+
)
÷[
×(5
﹣3
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