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运算定律

运算定律. 练习 连线. (a×b)×c 24+ （ 42+58 ） 76+18+22 67×(125×8) 42+24+58 a×(b×c) (67×125)×8 76+ （ 18+22 ）. 64×125. =8×125 ＋ 8×125 =1000 ＋ 1000 =2000. =8×8×125 =8×(8×125) =8×1000 =8000. 64×125. =(80+2) ×125 =80×125 ＋ 2×125

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运算定律

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  1. 运算定律

  2. 练习 连线 (a×b)×c 24+（42+58） 76+18+22 67×(125×8) 42+24+58 a×(b×c) (67×125)×8 76+（18+22）

  3. 64×125 =8×125＋8×125 =1000＋1000 =2000 =8×8×125 =8×(8×125) =8×1000 =8000 64×125

  4. =(80+2) ×125 =80×125＋2×125 =10000＋250 =10250 82×125

  5. =25×4×111 =(25×4)×111 =100×111 =11100 =4×4×25 =4×(4×25) =4×100 =400 16×25 25×444

  6. 98+999+9996+99997+10 =(98+2)+(999+1)+(9996+4)+(99997+3) =100+1000+10000+100000 =111100

  7. 1号本 简便运算 • (387+186)+314 • 789+3879+1201+121 • 56×125×2 • 4×303×25×6 • 88×125+25 (第5题能用两种方法的写出两种方法)

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