四年级上册数学运算律暑假衔接专项训练
-
简介
① 加法结合律：a+b+c=a+(b+c) 25+13+87 78+29+71 =25+(13+87) =78+(29+71) =25+100 =78+100 =125 =178 ② 减法性质：a-b-c=a-(b+c) 263-55-45 189-36-64 =263-(55+45) =189-(36+64) =263-100 =189-100 =163 =89 ③ 乘法结合律：a×b×c=a×(b×c) 34×4×25 125×88 =34×(4×25) =125×8×11 =34×100 =1000×11 =3400 =11000 ④ 乘法分配律：(a+b)×c=a×c+b×c；(a-b)×c=a×c-b×c (20+4)×25 36×12+36×8 =20×25+4×25 =36×(12+8) =500+100 =36×20 =600 =720
本年级热门下载
同类热门下载