知识大全 (1)10.1*87(2)0.25*0.03*4(3)2.65*1.7+1.35*1.7

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用简便方法计算:(1)10.1*87(2)0.25*0.03*4(3)2.65*1.7+1.35*1.7

1)10.1*87=(10+0.1)*87=870+8.7=878.7
2)0.25*0.03*4=(0.25*4)*0.03=1*0.03=0.03
3)2.65*1.7+1.35*1.7=(2.65+1.35)*1.7=4*1.7=6.8

计算,能简算的要简算:2.65×1.7+1.35×1.7 2.7

(1)2.65×1.7+1.35×1.7,
=(2.65+1.35)×1.7,
=4×1.7,
=6.8;

(2)2.7×2-0.45,
=5.4-0.45,
=4.95;

(3)0.25×101,
=0.25×(100+1),
=0.25×100+0.25×1,
=25+0.25,
=25.25.

计算下面各题,能用简便算法的用简便算法 12.25-3.1+0.85-6.17 2.65×1.7+1.35×1.7 6

(1)12.25-3.1+0.85-6.17,
=12.25+0.85-3.1-6.17,
=13.1-3.1-6.17,
=10-6.17,
=3.83;(2)2.65×1.7+1.35×1.7,
=(2.65+1.35)×1.7,
=4×1.7,
=6.8;

(3)6.9×10.1,
=6.9×10+6.9×0.1,
=69+0.69,
=69.69;

(4)0.125×25×80×0.4,
=(0.125×80)×(25×0.4),
=10×10,
=100.

脱式计算,能简算的要简算.2.65×1.7+1.35×1.7  ...

(1)2.65×1.7+1.35×1.7,
=(2.65+1.35)×1.7,
=4×1.7,
=6.8;

(2)23.4÷7.8-2.1,
=3-2.1,
=0.9;

(3)0.75×18÷0.15,
=0.75÷0.15×18,
=5×18,
=90;

(4)2.5×3.2×1.25,
=2.5×4×0.8×1.25,
=(2.5×4)×(0.8×1.25),
=10×1,
=10.

脱式计算,能简算的要简算. 2.65×1.7+1.35×1.7 23.4÷7.

根据题意可得:
(1)2.65×1.7+1.35×1.7,
=(2.65+1.35)×1.7,
=4×1.7,
=6.8;

(2)23.4÷7.8-2.1,
=3-2.1,
=0.9;

(3)0.25×0.8×4×0.125,
=(0.25×4)×(0.8×0.125),
=1×0.1,
=0.1.

用简便方法计算:0.25×0.03×4 10.1×7821....

(1)0.25×0.03×4
=(0.25×4)×0.03
=1×0.03
=0.03

(2)10.1×78
=100×78+0.1×78
=7800+7.8
=7807.8

(3)21.2×5+18.8×5
=(21.2+18.8)×5
=40×5
=200

(4)6.3+0.84+3.7+8.16
=6.3+0.84+3.7+8.16
=(6.3+3.7)+(0.84+8.16)
=10+9
=19

计算下面各题,能用简便算法的用简便算法12.25-3.1+0.85-6.17 2.65×1.7+1.35×1...

(1)12.25-3.1+0.85-6.17,
=(12.25+0.85)-3.1-6.17,
=13.1-3.1-6.17,
=3.83;
(2)2.65×1.7+1.35×1.7,
=(2.65+1.35)×1.7,
=4×1.7,
=6.8;
(3)3.6÷(1.2+0.5)×5,
=3.6÷1.7×5,
=

36
17

×5,
=10

10
17


(4)0.125×0.38×80,
=(0.125×80)×0.38,
=10×0.38,
=3.8;
(5)21.36÷0.8-12.9,
=26.7-12.9,
=13.8.

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