2.5×56+4.5×65,用简便方法计算。
2.5×56+4.5×65,用简便方法计算。
2.5×56+4.5×65
=5x0.5x56+5x0.9x65
=5x28+5x58.5
=5x(28+58.5)
=5x86.5
=432.5
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(-3.1)-(-4.5)+(+4.4)-(+1.3)-2.5用简便方法计算
(-3.1)-(-4.5)+(+4.4)-(+1.3)-2.5
=(-3.1-1.3+4.4)+(4.5-2.5)
=0+2
=2
用简便方法计算124×56-24×65
用简便方法计算124x56-24x56
124x56-24x56
=56*(124-24)
=56*100
=5600
用简便方法计算63.8-(4.5+23.8+2.5)
63.8-(4.5+23.8+2.5)
=63.8-23.8-(4.5+2.5)
=40-7
=33
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脱式计算(能用简便方法的用简便方法计算)2.5×(6+5×3.2);45×7.3+27×4.5; ...
(1)2.5×(6+5×3.2)
=2.5×(6+16)
=2.5×22
=55;
(2)45×7.3+27×4.5
=45×7.3+2.7×45
=45×(7.3+2.7)
=45×10
=450;
(3)5.8×101-5.8
=5.8×(101-1)
=5.8×100
=580;
(4)0.125×3.2×25
=0.125×(8×0.4)×25
=(0.125×8)×(0.4×25)
=1×10
=10;
(5)[8.3-(3.6+2.9)]×0.72
=[8.3-6.5]×0.72
=1.8×0.72
=1.296;
(6)10.2×4.5
=(10+0.2)×4.5
=10×4.5+0.2×4.5
=45+0.9
=45.9.
脱式计算(能用简便方法的用简便方法计算)2.5×(10+0.1)4.5×7.3+2.7×4.50.125×8×25×0.4 &nbs
①2.5×(10+0.1)
=2.5×10+2.5×0.1
=25+0.25
=25.25
②4.5×7.3+2.7×4.5
=4.5×(7.3+2.7)
=4.5×10
=45
③0.125×8×25×0.4
=(0.125×8)×(25×0.4)
=1×10
=10
④10.2×4.5
=(10+0.2)×4.5
=10×4.5+0.2×4.5
=45+0.9
=45.9
4.5×99+4.5用简便方法计算
4.5×99+4.5
=4.5x99+4.5x1
=4.5x(99+1)
=4.5x100
=450
用简便方法计算4.5+4.5+4.9Ⅹ98
4.5+4.5+4.9Ⅹ98
=(4.5X1)+(4.5X1)+(4.5X98)
=4.5X(1+1+98)
=4.5X100
=450
56×299+56用简便方法计算
56×299+56用简便方法计算
解答:
56×299+56
=56x(299+1)
=56x300
=16800
2024-11-01 广告