用简便方法计算.6.32+7.89+3.68 25.23-7.8-2.2 125×(33×8)49×19+81×49 720...
用简便方法计算.6.32+7.89+3.6825.23-7.8-2.2125×(33×8)49×19+81×497200÷4÷2578×51-78....
用简便方法计算.6.32+7.89+3.68 25.23-7.8-2.2 125×(33×8)49×19+81×49 7200÷4÷25 78×51-78.
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①6.32+7.89+3.68, =(6.32+3.68)+7.89, =10+7.89, =17.89; ②25.23-7.8-2.2, =25.23-(7.8+2.2), =25.23-10, =15.23; ③125×(33×8), =(125×8)×33, =1000×33, =33000; ④49×19+81×49, =49×(19+81), =49×100, =4900; ⑤7200÷4÷25, =7200÷(4×25), =7200÷100, =72; ⑥78×51-78, =78×(51-1), =78×50, =3900; |
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