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7.13 3.48竖式和验算

3.48*7.5竖式计算: 3 . 4 8* 7.5 1 7 4 0 2 4 3 6 2 6. 1 0 07.5 * 3.48 = 26.1

①3.48*0.05=0.174, 3.48 *0.05 0.174 ,②3.06*45=137.7, 3.06 *45 1530 1224 137.70 ,③8.45÷0.65=13,130.65 8.45 65 195 195 0 ,验证:0.65 *13 195 65 8.45 ,④0.9*1.07=0.963, 1.0 7 *0.9 0.963 ,⑤6.21÷0.03=207, 2070.03 6.21

7.25*5.3的竖式和验算7.25*5.3=38.425 验算:5.3*7.25=38.425

3.48 2.76+3.05 9.29

3.48+7.29怎么验算计算:3.48+7.29=10.77验算:两个加数交换位置和不变. 7.29+3.48=10.77或10.77-7.29=3.48或:10.77-3.48=7.29

3.48+6.52=10验算:;9.67-6.7=2.97验算:;4.05*7.2=29.16验算:;2.4÷0.16=15;验算:.

70-37.6=32.464.06+7.28=71.34 ☆14.25+5.35=19.6 验算:☆9.22-4.76=4.46 验算:4.8+2.6+5.2=4.8+5.2+2.6=10+2.6=12.6;15.6-4.7-5.3=15.6-(4.7+5.3)=15.6-10=5.6;3.48+9.6+16.52+10.4=(3.48+16.52)+(9.6+10.4)=20+20=40.

5.38+6.79=12.1782.4-3.48=78.9250-18.5=31.5验算:

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