下面各题怎样简便就怎样算.(1)3.7×99+3.7 (2) 3 4 ×7.7+3.3×0.75-75% (3)5.93+
下面各题怎样简便就怎样算.(1)3.7×99+3.7(2)34×7.7+3.3×0.75-75%(3)5.93+0.64+0.07+0.36(4)(7.9-3.06÷0....
下面各题怎样简便就怎样算.(1)3.7×99+3.7 (2) 3 4 ×7.7+3.3×0.75-75% (3)5.93+0.64+0.07+0.36 (4)(7.9-3.06÷0.68)×1.5 (5)78÷2.5÷0.4 (6)105×( 1 3 + 1 5 )
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(1)3.7×99+3.7, =3.7×(99+1), =3.7×100, =370; (2)
=0.75×7.7+3.3×0.75-0.75, =0.75×(7.7+3.3-1), =0.75×10, =7.5; (3)5.93+0.64+0.07+0.36, =(5.93+0.07)+(0.64+0.36), =6+1, =7; (4)(7.9-3.06÷0.68)×1.5, =(7.9-4.5)×1.5, =3.4×1.5, =5.1; (5)78÷2.5÷0.4, =78÷(2.5×0.4), =78÷1, =78; (6)105×(
=105×
=35+21, =56. |
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