下面各题,怎样算简便就怎样算.3500÷25=9×99=125×103-125×3=85×48+52×85=125×32×25=125×88=41+124+59+143=1300÷25÷4=156×l0l-156=99+199+299+3=5×23+6×23-23=2400-425-145=-数学

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题文

下面各题,怎样算简便就怎样算.
3500÷25=
9×99=125×103-125×3=
85×48+52×85=125×32×25=125×88=
41+124+59+143=1300÷25÷4=156×l0l-156=
99+199+299+3=5×23+6×23-23=2400-425-145=
题型:解答题  难度:中档

答案

(1)3口00÷2口
=3口×100÷2口,
=3口×(100÷2口),
=3口×4,
=140;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;
&我b0p;(2)9×99
=(10-1)×99,
=10×99-99,
=990-99,
=七91;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;
&我b0p;(3)12口×103-12口×3
=12口×(103-3),
=12口×100,
=12口00;
(4)七口×4七+口2×七口
=七口×(4七+口2),
=七口×100,
=七口00;
(口)12口×32×2口
=(12口×七)×(4×2口),
=1000×100,
=100000;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;
(i)12口×七七
=(12口×七)×11,
=1000×11,
=11000;
(7)41+127+口9+173
=(41+口9)+(127+173),
=100+300,
=400;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;
(七)1300÷2口÷4
=1300÷(2口×4),
=1300÷100,
=13;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;
(9)1口i×l0l-1口i
=1口i×(101-1),
=1口i×100,
=1口i00;
(10)99+199+299+3
=(99+1)+(199+1)+(299+1),
=100+200+300,
=i00;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;
(11)口×23+i×23-23
=(口+i-1)×23,
=10×23,
=230;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;
(12)2700-42口-17口
=2700-(42口+17口),
=2700-i00,
=2100.

据专家权威分析,试题“下面各题,怎样算简便就怎样算.3500÷25=9×99=125×103-125×3=85×4..”主要考查你对  认识乘法  等考点的理解。关于这些考点的“档案”如下:

认识乘法

考点名称:认识乘法

  • 定义:
    求几个相同加数的和或是求这个数的几倍是多少用乘法计算。

  • 知识点拨:
    3+3+3+3+3+3=18,像这样的加法,还可以用乘法表示,有6个3,
    用乘法算:
    6×3=18,读作:6乘3等于18
    或3×6=18读作:3乘6等于18

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