计算,下面各题能算的要简算。720÷中括号,小括号42-30,小小括号乘24,中括号。
计算下面各题,能简算的要简算.(720÷8+21)×3125×8835×(26÷2+7)400÷[300-(260-160)]78×56-56×28156×l0l-156...
计算下面各题,能简算的要简算. (720÷8+21)×3 125×88 35×(26÷2+7) 400÷[300-(260-160)] 78×56-56×28 156×l0l-156.
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(1)(720÷8+21)×3
=(90+21)×3
=111×3
=333;
(2)125×88
=125×8×11
=1000×11
=11000;
(3)35×(26÷2+7)
=35×(13+7)
=35×20
=700;
(4)400÷[300-(260-160)]
=400÷[300-100]
=400÷200
=2;
(5)78×56-56×28
=(78-28)×56
=60×56
=3360;
(6)156×l0l-156
=156×(l0l-1)
=156×100
=15600.
=(90+21)×3
=111×3
=333;
(2)125×88
=125×8×11
=1000×11
=11000;
(3)35×(26÷2+7)
=35×(13+7)
=35×20
=700;
(4)400÷[300-(260-160)]
=400÷[300-100]
=400÷200
=2;
(5)78×56-56×28
=(78-28)×56
=60×56
=3360;
(6)156×l0l-156
=156×(l0l-1)
=156×100
=15600.
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