脱式计算.(能简算的要简算)(1) 1 43 + 303 8686 + 90909 434343 +
脱式计算.(能简算的要简算)(1)143+3038686+90909434343+131313868686(2)6.75-2.75÷[10×(9.75-414)](3)0...
脱式计算.(能简算的要简算)(1) 1 43 + 303 8686 + 90909 434343 + 131313 868686 (2) 6.75-2.75÷[10×(9.75-4 1 4 )] (3) 0.365×640+3 1 2 ×36.5+365×0.01 .
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冰文灯1786
2014-11-25
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(1) + + + , = + + + , = + + + , =( + )+( + ), = + , = ;
(2)6.75-2.75÷[10×(9.75-4 )], =6.75-2.75÷[10×(9.75-4.25)], =6.75-2.75÷[10×5.5], =6.75-2.75÷55, =6.75-0.05, =6.7;
(3)0.365×640+3 ×36.5+365×0.01, =36.5×6.4+3.5×36.5+36.5×0.1, =36.5×(6.4+3.5+0.1), =36.5×10, =365. |
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