非常急..【1、填空】8.8×7.5=8×【 】×【 】×2.5=﹙【 】×【 】﹚×﹙8×2.5﹚7.9×2.1+7.9×7.9=【 】×﹙【 】+【 】﹚2.5×﹙2.83×0.4﹚=﹙【 】×【 】﹚×【 】【2、脱式计算,能简便的就简便】 25×
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非常急..【1、填空】8.8×7.5=8×【 】×【 】×2.5=﹙【 】×【 】﹚×﹙8×2.5﹚7.9×2.1+7.9×7.9=【 】×﹙【 】+【 】﹚2.5×﹙2.83×0.4﹚=﹙【 】×【 】﹚×【 】【2、脱式计算,能简便的就简便】 25×
非常急..
【1、填空】8.8×7.5=8×【 】×【 】×2.5=﹙【 】×【 】﹚×﹙8×2.5﹚
7.9×2.1+7.9×7.9=【 】×﹙【 】+【 】﹚
2.5×﹙2.83×0.4﹚=﹙【 】×【 】﹚×【 】
【2、脱式计算,能简便的就简便】 25×6.7-25×2.7 3.7×2.3+2.3×6.3 99×3.5+3.5
= = =
= = =
非常急..【1、填空】8.8×7.5=8×【 】×【 】×2.5=﹙【 】×【 】﹚×﹙8×2.5﹚7.9×2.1+7.9×7.9=【 】×﹙【 】+【 】﹚2.5×﹙2.83×0.4﹚=﹙【 】×【 】﹚×【 】【2、脱式计算,能简便的就简便】 25×
8.8×7.5=8×【1.1 】×【 3 】×2.5=﹙【 1.1 】×【3 】﹚×﹙8×2.5﹚
7.9×2.1+7.9×7.9=【 7.9 】×﹙【2.1 】+【 7.9 】﹚
2.5×﹙2.83×0.4﹚=﹙【 2.5 】×【 0.4 】﹚×【 2.83 】
25×6.7-25×2.7
=25×﹙6.7-2.7﹚
=25×4
=100
3.7×2.3+2.3×6.3
=2.3×﹙3.7+6.3﹚
=2.3×10
=23
99×3.5+3.5
=3.5×﹙99+1﹚
=3.5×100
=350.
【1、填空】8.8×7.5=8×【1.1 】×【 3 】×2.5=﹙【1.1 】×【3 】﹚×﹙8×2.5﹚
7.9×2.1+7.9×7.9=【 7.9 】×﹙【 2.1 】+【 7.9 】﹚
2.5×﹙2.83×0.4﹚=﹙【2.5 】×【 0.4 】﹚×【 2.83 】...
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【1、填空】8.8×7.5=8×【1.1 】×【 3 】×2.5=﹙【1.1 】×【3 】﹚×﹙8×2.5﹚
7.9×2.1+7.9×7.9=【 7.9 】×﹙【 2.1 】+【 7.9 】﹚
2.5×﹙2.83×0.4﹚=﹙【2.5 】×【 0.4 】﹚×【 2.83 】
【2、脱式计算,能简便的就简便】 25×6.7-25×2.7 3.7×2.3+2.3×6.3 99×3.5+3.5
= 25x(6.7-2.7) =2.3x(3.7+6.3) =3.5x(99+1)
= 100 = 23 =350
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1、 1.1×3 1.1×3
7.9×(2.1+7.9)
(2.5×0.4)×2.83
2、 =25×﹙6.7-2.7﹚=25×4=100
=2.3×﹙3.7+6.3﹚=2.3×10=23
=3.5×﹙99+1﹚=3.5×100=350
(1)1.1, 3, 1.1, 3,
7.9, 2.1, 2
2.5, 0.4, 2.83
(2)=25*(6.7-2.7)=25*4=100
=2.3*(3.7+6.3)=2.3*10=23
=3.5*(99+1)+3.5*100=350
8.8×7.5=8×【1.1 】×【 3 】×2.5=﹙【 1.1 】×【 3 】﹚×﹙8×2.5﹚
&nbs...
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8.8×7.5=8×【1.1 】×【 3 】×2.5=﹙【 1.1 】×【 3 】﹚×﹙8×2.5﹚ 25×6.7-25×2.7 3.7×2.3+2.3×6.3 99×3.5+3.5 =25×(6.7-2.7) =(3.7+6.3)×2.3 =(99+1)×3.5 =25×4 =10×2.3 =100×3.5 =100 =23 =350
7.9×2.1+7.9×7.9=【 7.9 】×﹙【 2.1 】+【 7.9 】﹚
2.5×﹙2.83×0.4﹚=﹙【 2.5 】×【 0.4 】﹚×【 2.83 】
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