用递等式计算,能简便计算的要用简便方法计算. 38%× 3 5 +0.4× 19 50 89
用递等式计算,能简便计算的要用简便方法计算.38%×35+0.4×195089×6.3+48.9×0.3713411-(223-1711)2.5×37×0.4×21315...
用递等式计算,能简便计算的要用简便方法计算. 38%× 3 5 +0.4× 19 50 89×6.3+48.9×0.37 13 4 11 -( 2 2 3 - 1 7 11 ) 2.5× 3 7 ×0.4× 2 1 3 158-92+42-8 83.2÷(83.2÷11)
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(1)38%×
=0.38×0.6+0.4×0.38, =(0.6+0.4)×0.38, =0.38; (2)89×6.3+48.9×0.37, =560.7+18.093, =578.793; (3)13
=13
=15-2
=12
(4)2.5×
=(2.5×0.4)×(
=1×1, =1; (5)158-92+42-8, =(158+42)-(92+8), =200-100, =100; (6)83.2÷(83.2÷11), =83.2÷83.2×11, =11. |
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