脱式计算,能简算的要简算.2.31×1.5+1.5×7.69 23.4÷7.8
脱式计算,能简算的要简算.2.31×1.5+1.5×7.6923.4÷7.8-2.14.5×0.4÷4.5×0.46.4×101-6.44×1.98×0.257.5+2....
脱式计算,能简算的要简算.2.31×1.5+1.5×7.69 23.4÷7.8-2.1 4.5×0.4÷4.5×0.4 6.4×101-6.4 4×1.98×0.25 7.5+2.5-7.5+2.5.
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(1)2.31×1.5+1.5×7.69 =(2.31+7.69)×1.5 =10×1.5 =15; (2)23.4÷7.8-2.1 =3-2.1 =0.9; (3)4.5×0.4÷4.5×0.4 =4.5÷4.5×0.4×0.4 =1×0.4×0.4 =0.16; (4)6.4×101-6.4 =6.4×(101-1) =6.4×100 =640; (5)4×1.98×0.25 =4×0.25×1.98 =1×1.98 =1.98; (6)7.5+2.5-7.5+2.5 =7.5-7.5+(2.5+2.5) =0+5 =5. |
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