脱式计算.(能简算的要简算)7820-375-625 25×33×4 329+753+571+47 75+47×3 2500÷4÷25 (16+24)×
脱式计算.(能简算的要简算)7820-375-62525×33×4329+753+571+4775+47×32500÷4÷25(16+24)×35÷70875+209+1...
脱式计算.(能简算的要简算)7820-375-625 25×33×4 329+753+571+47 75+47×3 2500÷4÷25 (16+24)×35÷70 875+209+191-75 57×43+33×43.
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(1)7820-375-625, =7820-(375+625), =7820-1000, =6820; (2)25×33×4, =25×4×33, =100×33, =3300; (3)329+753+571+47, =(329+571)+(47+753), =900+800, =1700; (4)75+47×3, =75+141, =216; (5)2500÷4÷25, =2500÷(4×25), =2500÷100, =25; (6)(16+24)×35÷70, =40×35÷70, =1400÷70, =20; (7)875+209+191-75, =(875-75)+(209+191), =800+400, =1200; (8)57×43+33×43, =(57+33)×43, =90×43, =3870. |
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