递等式计算,能简便计算的一定要简便计算.25×40.1 12.5×3.2 100.98÷9 (0.25+0.25+0.25)×4
递等式计算,能简便计算的一定要简便计算.25×40.112.5×3.2100.98÷9(0.25+0.25+0.25)×45.64÷2.5÷0.4....
递等式计算,能简便计算的一定要简便计算.25×40.1 12.5×3.2 100.98÷9 (0.25+0.25+0.25)×4 5.64÷2.5÷0.4.
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(1)25×40.1 =25×(40+0.1), =25×40+25×0.1, =100+2.5, =102.5; (2)12.5×3.2 =12.5×0.8×4, =10×4, =40; (3)100.98÷9 =(99+1.98)÷9. =99÷9+1.98÷9, =11+0.22, =11.22; (4)(0.25+0.25+0.25)×4 =3×(0.25×4), =3×1, =3; (5)5.64÷2.5÷0.4 =5.64÷(2.5×0.4), =5.64÷1, =5.64. |
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