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简便计算:2.5×3.2×12.56.3÷1.42.5×2.415.32×4+4.68÷0.252.55×1.5+1.5+6.45×1.52.95×101-2.953.12+3.12×9915÷(0.15×0.4)2.55×1.5+1.5+6.45×1.573.8-1.64-13.8-5.366.75-(0.9+3.75)27.38-5.34+2
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答案和解析
(1)2.5×3.2×12.5 =2.5×0.4×8×12.5, =1×8×12.5, =8×12.5, =100; (2)6.3÷1.4 =6.3÷(0.7×2), =6.3÷0.7÷2, =9÷2, =4.5; (3)2.5×2.4 =2.5×4×0.6, =10×0.6, =6; (4)15.32×4+4.68÷0.25 =15.32×4+4.68÷
=15.32×4+4.68×4, =(15.32+4.68)×4, =20×4, =80; (5)2.55×1.5+1.5+6.45×1.5 =2.55×1.5+1.5×1+6.45×1.5 =(2.55+1+6.45)×1.5, =9×1.5, =13.5; (6)2.95×101-2.95 =2.95×(101-1), =2.95×100, =295; (7)3.12+3.12×99 =3.12×1+3.12×99, =3.12×(99+1), =3.12×100, =312; (8)15÷(0.15×0.4) =15÷0.15÷0.4, =100÷0.4, =250; (9)2.55×1.5+1.5+6.45×1.5 =2.55×1.5+1.5×1+6.45×1.5 =(2.55+1+6.45)×1.5, =10×1.5, =15; (10)73.8-1.64-13.8-5.36 =73.8-13.8-(1.64+5.36), =60-7, =53; (11)6.75-(0.9+3.75) =6.75-3.75-0.9, =3-0.9, =2.1; (12)27.38-5.34+2.62-4.66 =22.04+2.62-4.66, =24.66-4.66, =20; (13)35.72-4.9-(5.72+5.1) =35.72-(4.9+5.72+5.1), =35.72-15.72, =20; (14)0.73-0.25-0.73+0.25 =0.75-0.75-0.25+0.25, =0-0.25+0.25, =0-0, =0; (15)5.3+0.1+5.3-0.1 =5.3+5.3+0.1-0.1, =10.6+0.1-0.1, =10.7-0.1, =10.6; (16)12.7-4.8-5.2. =12.7-(4.8+5.2); =12.7-10, =2.7. |
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