计算能用简便的要简便618×8+8×312 3200÷4÷25 525×39÷...
计算能用简便的要简便618×8+8×3123200÷4÷25525×39÷25(720-180)÷27×164.02-2.5+0.9851.27-8.66-1.3424....
计算能用简便的要简便618×8+8×312 3200÷4÷25 525×39÷25 (720-180)÷27×16 4.02-2.5+0.98 51.27-8.66-1.34 24.42-(6.5+0.42)-3.5 45×101 13.75-4.18-5.82 75+360÷(20-5)99×56 23.38-( 19.38-4.76)
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(1)618×8+8×312
=(618+312)×8
=930×8
=7440;
(2)3200÷4÷25
=3200÷(4×25)
=3200÷100
=32;
(3)525×39÷25
=525÷25×39
=21×39
=819;
(4)(720-180)÷27×16
=540÷27×16
=20×16
=320;
(5)4.02-2.5+0.98
=4.02+0.98-2.5
=5-2.5
=2.5;
(6)51.27-8.66-1.34
=51.27-(8.66+1.34)
=51.27-10
=41.27;
(7)24.42-(6.5+0.42)-3.5
=24.42-0.42-(3.5+6.5)
=24-10
=14;
(8)45×101
=45×(100+1)
=45×100+45×1
=4500+45
=4545;
(9)13.75-4.18-5.82
=13.75-(4.18+5.82)
=13.75-10
=3.75;
(10)75+360÷(20-5)
=75+360÷15
=75+24
=99;
(11)99×56
=(100-1)×56
=100×56-1×56
=5600-56
=5544;
(12)23.38-( 19.38-4.76)
=23.38-19.38+4.76
=4+4.76
=8.76.
=(618+312)×8
=930×8
=7440;
(2)3200÷4÷25
=3200÷(4×25)
=3200÷100
=32;
(3)525×39÷25
=525÷25×39
=21×39
=819;
(4)(720-180)÷27×16
=540÷27×16
=20×16
=320;
(5)4.02-2.5+0.98
=4.02+0.98-2.5
=5-2.5
=2.5;
(6)51.27-8.66-1.34
=51.27-(8.66+1.34)
=51.27-10
=41.27;
(7)24.42-(6.5+0.42)-3.5
=24.42-0.42-(3.5+6.5)
=24-10
=14;
(8)45×101
=45×(100+1)
=45×100+45×1
=4500+45
=4545;
(9)13.75-4.18-5.82
=13.75-(4.18+5.82)
=13.75-10
=3.75;
(10)75+360÷(20-5)
=75+360÷15
=75+24
=99;
(11)99×56
=(100-1)×56
=100×56-1×56
=5600-56
=5544;
(12)23.38-( 19.38-4.76)
=23.38-19.38+4.76
=4+4.76
=8.76.
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