用简便方法计算:73+3.4+27+5.6 7.25-3.42-1.58 ...
用简便方法计算:73+3.4+27+5.67.25-3.42-1.5829.38-(19.38-4.76)363×7+237×74300÷25÷478×101...
用简便方法计算:73+3.4+27+5.6 7.25-3.42-1.58 29.38-(19.38-4.76)363×7+237×7 4300÷25÷4 78×101
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解;①73+3.4+27+5.6
=(73+27)+(3.4+5.6)
=100+9
=109;
②7.25-3.42-1.58
=7.25-(3.42+1.58)
=7.25-5
=2.25;
③29.38-(19.38-4.76)
=29.38-19.38+4.76
=10+4.76
=14.76;
④363×7+237×7
=(363+237)×7
=600×7
=4200;
⑤4300÷25÷4
=4300÷(25×4)
=4300÷100
=43;
⑥78×101
=78×(100+1)
=78×100+78×1
=7800+78
=7878.
=(73+27)+(3.4+5.6)
=100+9
=109;
②7.25-3.42-1.58
=7.25-(3.42+1.58)
=7.25-5
=2.25;
③29.38-(19.38-4.76)
=29.38-19.38+4.76
=10+4.76
=14.76;
④363×7+237×7
=(363+237)×7
=600×7
=4200;
⑤4300÷25÷4
=4300÷(25×4)
=4300÷100
=43;
⑥78×101
=78×(100+1)
=78×100+78×1
=7800+78
=7878.
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