用简便方法计算①2.6+6.92+3.4+0.0
用简便方法计算①2.6+6.92+3.4+0.08②3200÷4÷5③8.8-4.3-3.7④312×4+188×4⑤32×125×25⑥2.43-(0.28+1.43)...
用简便方法计算①2.6+6.92+3.4+0.08 ②3200÷4÷5 ③8.8-4.3-3.7 ④312×4+188×4 ⑤32×125×25 ⑥2.43-(0.28+1.43)
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①2.6+6.92+3.4+0.08, =(2.6+3.4)+(6.92+0.08), =6+7, =13; ②3200÷4÷5, =3200÷(4×5), =3200÷20, =160; ③8.8-4.3-3.7, =8.8-(4.3+3.7), =8.8-8, =0.8; ④312×4+188×4, =4×(312+188), =4×500, =2000; ⑤32×125×25, =(4×25)×(125×8), =100×1000, =100000; ⑥2.43-(0.28+1.43), =2.43-1.43-0.28, =1-0.28, =0.72. |
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