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①3.1+(25.78+6.9)=(3.1+6.9)+25.78=10+25.78=35.78②15.25+4.72+4.75+5.28=(15.25+4.75)+(4.72+5.28)=20+10=30③34.82-(4.82+15.2)=34.82-4.82-15.2=30-15.2=14.8④12.7-4.8-5.2=12.7-(4.8+5.2)=12.7-10=2.7 ...
简便计算3.1+25.78+6.9; 15.17-6.8-3.2; 34.82-(4.82+15.2);8.6...(1)3.1+25.78+6.9=3.1+6.9+25.78=10+25.78=35.78;(2)15.17-6.8-3.2=15.17-(6.8+3.2)=15.17-10=5.17;(3)34.82-(4.82+15.2)=34.82-4.82-15.2=30-15.2=14.8;(4)8.64-2.4+2.36-1.6=(8.64+2.36)-(2.4+1.6)=11-4=7.
简便计算3.1+25.78+6.9=3+25+6+0.1+0.9+0.78 =3+6+(0.1+0.9)+25+0.78 =10+25+0.78 =35.78
3.1十25.78十6.9用简便方法计算=3.1+6.9+25.78 =10+25.78 =35.78
简便计算3.1+25.78+6.9 ...(1)3.1+25.78+6.9,=(3.1+6.9)+25.78,=10+25.78,=35.78;(2)12.7-4.8-5.2,=12.7-(4.8+5.2),=12.7-10,=2.7;(3)34.82-(4.82+15.2),=34.82-4.82-15.2,=30-15.2,=14.8;(4)15.25+4.72+4.75+5.28,=(15.25+4.75)+(4....
用简便方法计算 3.1+25.78+6.91(1)3.1+25.78+6.9=3.1+6.9+25.78=10+25.78=35.78;(2)12.7-4.8-5.2=12.7-(4.8+5.2)=12.7-10=2.7;(3)8.64-2.4+2.36-1.6=(8.64+2.36)-(2.4+1.6)=11-4=7.
简便计算3.1+25.7(1)3.1+25.78+6.9,=(3.1+6.9)+25.78,=10+25.78,=35.78;(2)12.7-4.8-5.2,=12.7-(4.8+5.2),=12.7-10,=2.7;(3)34.82-(4.82+15.2),=34.82-4.82-15.2,=30-15.2,=14.8;(4)15.25+4.72+4.75+5.28,=(15.25+4.75)+(4....
3.1+25.78+6.7=先算乃一个3.1+25.78+6.7 =(3.1+6.7+0.2)+(25.78-0.2)=10+25.58 =35.58
简便计算13.8-2.99①13.8-2.99,=13.8-3+0.01,=10.8+0.01,=10.81;②3.1+25.78+6.9,=(3.1+6.9)+25.78,=10+25.78,=35.78;③12.7-4.8-5.2,=12.7-(4.8+5.2),=12.7-10,=2.7;④34.82-(4.82+15.2),=34.82-4.82-15.2,=30-15.2,=14.8;⑤15.25+4...
数学题脱式计算脱式计算(二)7.0910.8-0.87.09 (9.37+9.37+9.37+9.37) 2.5 =7,08(10.8-0.8) =4*9.37*2.5 =7.09 ×10 =10*9.37 =70.9 =93.7 0.68 (5.2 -3.5) 1.25 9.28×13-9.28×4+9.28 =0.68/1.7 ×(1.25) =9.28...