简便计算.216+30525×3247+236+646×(15×9)402+35943+78+122+25725×(26×4)25×44354+(229+46)-四年级数学

题目简介

简便计算.216+30525×3247+236+646×(15×9)402+35943+78+122+25725×(26×4)25×44354+(229+46)-四年级数学

题目详情

简便计算.
216+305          25×32           47+236+64
6×(15×9)402+359         43+78+122+257
25×(26×4)25×44         354+(229+46)
题型:解答题难度:中档来源:不详

答案

①216+305,
=200+16+300+5,
=200+300+16+5,
=500+21,
=521;
②25×32,
=25×4×8,
=800;
③47+236+64,
=47+(64+236),
=47+300,
=347;
④6×(15×9),
=6×15×9,
=90×9,
=810;
⑤402+539,
=400+(2+539),
=400+541,
=941;
⑥43+78+122+257,
=(43+257)+(78+122),
=300+200,
=500;
⑦25×(26×4),
=25×4×26,
=100×26,
=2600;
⑧25×44,
=25×4×11,
=100×11,
=1100;
⑨354+(229+46),
=354+46+229,
=400+229,
=629;

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