用递等式计算(能简算的要简算).2800-(48×15÷24) 46×27+27×54 9...
用递等式计算(能简算的要简算).2800-(48×15÷24)46×27+27×54950+560÷14×28125×88113.7+76.88-47.317.48-4....
用递等式计算(能简算的要简算).2800-(48×15÷24) 46×27+27×54 950+560÷14×28 125×88 113.7+76.88-47.3 17.48-4.57-5.43 25×102 125×32×25 53×25+530×7.5 1.375+0.35+2.65 4.8+5.07+2.2+4.93 103×99+103
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(1)2800-(48×15÷24)
=2800-720÷24
=2800-30
=2770;
(2)46×27+27×54
=(46+54)×27
=100×27
=2700;
(3)950+560÷14×28
=950+40×28
=950+1120
=2070;
(4)125×88
=125×8×11
=1000×11
=11000;
(5)113.7+76.88-47.3
=190.58-47.3
=143.28;
(6)17.48-4.57-5.43
=17.48-(4.57+5.43)
=17.48-10
=7.48;
(7)25×102
=25×100+25×2
=2500+50
=2550;
(8)125×32×25
=125×8×(4×25)
=1000×100
=100000;
(9)53×25+530×7.5
=53×25+53×75
=53×(25+75)
=53×100
=5300;
(10)1.375+0.35+2.65
=1.375+(0.35+2.65)
=1.375+3
=4.375;
(11)4.8+5.07+2.2+4.93
=4.8+2.2+(4.93+5.07)
=7+10
=17;
(12)103×99+103
=103×(99+1)
=103×100
=10300.
=2800-720÷24
=2800-30
=2770;
(2)46×27+27×54
=(46+54)×27
=100×27
=2700;
(3)950+560÷14×28
=950+40×28
=950+1120
=2070;
(4)125×88
=125×8×11
=1000×11
=11000;
(5)113.7+76.88-47.3
=190.58-47.3
=143.28;
(6)17.48-4.57-5.43
=17.48-(4.57+5.43)
=17.48-10
=7.48;
(7)25×102
=25×100+25×2
=2500+50
=2550;
(8)125×32×25
=125×8×(4×25)
=1000×100
=100000;
(9)53×25+530×7.5
=53×25+53×75
=53×(25+75)
=53×100
=5300;
(10)1.375+0.35+2.65
=1.375+(0.35+2.65)
=1.375+3
=4.375;
(11)4.8+5.07+2.2+4.93
=4.8+2.2+(4.93+5.07)
=7+10
=17;
(12)103×99+103
=103×(99+1)
=103×100
=10300.
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